CVE-2026-29045

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-29045", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-03T17:50:11.243Z", "datePublished": "2026-03-04T22:09:22.045Z", "dateUpdated": "2026-03-05T15:42:05.041Z"}, "containers": {"cna": {"title": "Hono: Arbitrary file access via serveStatic vulnerability", "problemTypes": [{"descriptions": [{"cweId": "CWE-177", "lang": "en", "description": "CWE-177: Improper Handling of URL Encoding (Hex Encoding)", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr"}, {"name": "https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3", "tags": ["x_refsource_MISC"], "url": "https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3"}], "affected": [{"vendor": "honojs", "product": "hono", "versions": [{"version": "< 4.12.4", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-04T22:09:22.045Z"}, "descriptions": [{"lang": "en", "value": "Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, when using serveStatic together with route-based middleware protections (e.g. app.use('/admin/*', ...)), inconsistent URL decoding allowed protected static resources to be accessed without authorization. The router used decodeURI, while serveStatic used decodeURIComponent. This mismatch allowed paths containing encoded slashes (%2F) to bypass middleware protections while still resolving to the intended filesystem path. This issue has been patched in version 4.12.4."}], "source": {"advisory": "GHSA-q5qw-h33p-qvwr", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-05T15:39:29.390771Z", "id": "CVE-2026-29045", "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": "2026-03-05T15:42:05.041Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-29045", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-05T15:39:29.390771Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-05T15:39:30.478Z"}}], "cna": {"title": "Hono: Arbitrary file access via serveStatic vulnerability", "source": {"advisory": "GHSA-q5qw-h33p-qvwr", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}], "affected": [{"vendor": "honojs", "product": "hono", "versions": [{"status": "affected", "version": "< 4.12.4"}]}], "references": [{"url": "https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr", "name": "https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3", "name": "https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, when using serveStatic together with route-based middleware protections (e.g. app.use('/admin/*', ...)), inconsistent URL decoding allowed protected static resources to be accessed without authorization. The router used decodeURI, while serveStatic used decodeURIComponent. This mismatch allowed paths containing encoded slashes (%2F) to bypass middleware protections while still resolving to the intended filesystem path. This issue has been patched in version 4.12.4."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-177", "description": "CWE-177: Improper Handling of URL Encoding (Hex Encoding)"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-04T22:09:22.045Z"}}}, "cveMetadata": {"cveId": "CVE-2026-29045", "state": "PUBLISHED", "dateUpdated": "2026-03-05T15:42:05.041Z", "dateReserved": "2026-03-03T17:50:11.243Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-03-04T22:09:22.045Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "hono", "vendor": "honojs", "versions": [{"status": "affected", "version": "< 4.12.4"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "8ADA9966-4575-41CC-8905-E1F4E4CB5CA6", "versionEndExcluding": "4.12.4", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, when using serveStatic together with route-based middleware protections (e.g. app.use('/admin/*', ...)), inconsistent URL decoding allowed protected static resources to be accessed without authorization. The router used decodeURI, while serveStatic used decodeURIComponent. This mismatch allowed paths containing encoded slashes (%2F) to bypass middleware protections while still resolving to the intended filesystem path. This issue has been patched in version 4.12.4."}, {"lang": "es", "value": "Hono es un framework de aplicaci\u00f3n web que proporciona soporte para cualquier tiempo de ejecuci\u00f3n de JavaScript. Antes de la versi\u00f3n 4.12.4, cuando se usaba serveStatic junto con protecciones de middleware basadas en rutas (p. ej., app.use('/admin/*', ...)), una decodificaci\u00f3n inconsistente de URL permit\u00eda que se accediera a recursos est\u00e1ticos protegidos sin autorizaci\u00f3n. El router usaba decodeURI, mientras que serveStatic usaba decodeURIComponent. Esta discrepancia permit\u00eda que las rutas que conten\u00edan barras codificadas (%2F) eludieran las protecciones de middleware mientras segu\u00edan resolvi\u00e9ndose a la ruta de sistema de archivos prevista. Este problema ha sido parcheado en la versi\u00f3n 4.12.4."}], "id": "CVE-2026-29045", "lastModified": "2026-06-17T10:29:30.013", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-29045", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-05T15:39:29.390771Z", "version": "2.0.3"}}]}, "published": "2026-03-04T23:16:10.247", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-177"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.12.4)"}}], "enrichment": {"confidence": 90.0, "confidence_source": "matching", "scores": [{"score": 90.0, "source": "matching"}]}, "original": {"product": "hono", "source": "cna", "vendor": "honojs"}, "product": "hono", "vendor": "hono"}], "analysis": {"en": {"generated_at": "2026-04-17T13:01:06.691638+00:00", "value": {"mitigation_remediation": ["Upgrade Hono to version 4.12.4 or later to apply the patched URL\u2011decoding logic.", "Reconfigure or remove serveStatic usage where route\u2011based authentication is applied, or switch to a static file handler that correctly aligns decoding behavior with the router.", "If upgrading immediately is not feasible, replace serveStatic with an alternative that enforces strict path normalization or explicitly validates and rejects encoded slashes before file resolution."], "summary": {"action": "Apply Patch", "impact": "Arbitrary File Access"}, "threat_synthesis": {"affected_systems": "Hono framework (honojs:hono) versions earlier than 4.12.4 are impacted. The issue exists in any JavaScript runtime that runs Hono and configures serveStatic in combination with route\u2011based middleware such as app.use('/admin/*', ...) for protecting static content.", "description_and_impact": "The vulnerability in Hono\u2019s serveStatic middleware is an inconsistent encoding flaw (CWE\u2011177) that allows attackers to read protected static files. Hono\u2019s router uses decodeURI while serveStatic uses decodeURIComponent, so request paths containing encoded slashes (%2F) can bypass route\u2011based middleware protections. Exploiting this mismatch grants unauthorized read access to filesystem resources, leading to disclosure of sensitive data.", "risk_and_exploitability": "The CVSS score of 7.5 indicates a high severity, but the EPSS score of less than 1% suggests a low probability of exploitation at this time. The vulnerability is not listed in the CISA KEV catalog, implying no known widespread exploitation. The likely attack vector is remote, delivered via crafted HTTP requests that target the web application\u2019s static file endpoints. Exploitation requires prior deployment of Hono with serveStatic configured and route\u2011based middleware; no additional access or privileges are necessary. The risk remains moderate to high until the issue is fixed by upgrading the framework."}}}}, "created": "2026-03-05T09:05:36.392980+00:00", "updated": "2026-04-17T13:15:19.647247+00:00", "vendors": ["hono", "hono$PRODUCT$hono"]}