CVE-2026-71849

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-71849", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-08-07T18:26:53.523Z", "datePublished": "2026-08-07T18:38:16.287Z", "dateUpdated": "2026-08-10T12:03:12.470Z"}, "containers": {"cna": {"title": "Hono: Proxy Helper does not remove response headers listed in the `Connection` header", "problemTypes": [{"descriptions": [{"cweId": "CWE-200", "lang": "en", "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/honojs/hono/security/advisories/GHSA-79qm-7rj5-m7r9", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/honojs/hono/security/advisories/GHSA-79qm-7rj5-m7r9"}, {"name": "https://github.com/honojs/hono/commit/720b566290793d4358bf39843adcb7cf4da4548f", "tags": ["x_refsource_MISC"], "url": "https://github.com/honojs/hono/commit/720b566290793d4358bf39843adcb7cf4da4548f"}, {"name": "https://github.com/honojs/hono/releases/tag/v4.12.34", "tags": ["x_refsource_MISC"], "url": "https://github.com/honojs/hono/releases/tag/v4.12.34"}], "affected": [{"vendor": "honojs", "product": "hono", "versions": [{"version": ">= 4.7.0, < 4.12.34", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-07T18:38:16.287Z"}, "descriptions": [{"lang": "en", "value": "Hono is a Web application framework that provides support for any JavaScript runtime. From 4.7.0 to 4.12.33, the Proxy Helper proxy() function in hono/proxy does not remove response headers named by the origin's Connection header. Per RFC 9110 Section 7.6.1, an intermediary must remove the header fields listed in a message's Connection header field before forwarding the message, in addition to the well known hop by hop headers, but the proxy() function only removed the well known hop by hop headers, including Connection itself, from origin responses. A client may therefore receive response headers that the origin intended only for its immediate peer, disclosing connection scoped or internal metadata contained in such headers, when an application proxies responses from an origin that declares additional, non standard headers as hop by hop via the Connection response header. This issue is fixed in version 4.12.34."}], "source": {"advisory": "GHSA-79qm-7rj5-m7r9", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-10T12:02:52.553186Z", "id": "CVE-2026-71849", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"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": "2026-08-10T12:03:12.470Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-71849", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-10T12:02:52.553186Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-10T12:02:57.231Z"}}], "cna": {"title": "Hono: Proxy Helper does not remove response headers listed in the `Connection` header", "source": {"advisory": "GHSA-79qm-7rj5-m7r9", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.7, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}], "affected": [{"vendor": "honojs", "product": "hono", "versions": [{"status": "affected", "version": ">= 4.7.0, < 4.12.34"}]}], "references": [{"url": "https://github.com/honojs/hono/security/advisories/GHSA-79qm-7rj5-m7r9", "name": "https://github.com/honojs/hono/security/advisories/GHSA-79qm-7rj5-m7r9", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/honojs/hono/commit/720b566290793d4358bf39843adcb7cf4da4548f", "name": "https://github.com/honojs/hono/commit/720b566290793d4358bf39843adcb7cf4da4548f", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/honojs/hono/releases/tag/v4.12.34", "name": "https://github.com/honojs/hono/releases/tag/v4.12.34", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Hono is a Web application framework that provides support for any JavaScript runtime. From 4.7.0 to 4.12.33, the Proxy Helper proxy() function in hono/proxy does not remove response headers named by the origin's Connection header. Per RFC 9110 Section 7.6.1, an intermediary must remove the header fields listed in a message's Connection header field before forwarding the message, in addition to the well known hop by hop headers, but the proxy() function only removed the well known hop by hop headers, including Connection itself, from origin responses. A client may therefore receive response headers that the origin intended only for its immediate peer, disclosing connection scoped or internal metadata contained in such headers, when an application proxies responses from an origin that declares additional, non standard headers as hop by hop via the Connection response header. This issue is fixed in version 4.12.34."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-200", "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-07T18:38:16.287Z"}}}, "cveMetadata": {"cveId": "CVE-2026-71849", "state": "PUBLISHED", "dateUpdated": "2026-08-10T12:03:12.470Z", "dateReserved": "2026-08-07T18:26:53.523Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-08-07T18:38:16.287Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "hono", "vendor": "honojs", "versions": [{"status": "affected", "version": ">= 4.7.0, < 4.12.34"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Hono is a Web application framework that provides support for any JavaScript runtime. From 4.7.0 to 4.12.33, the Proxy Helper proxy() function in hono/proxy does not remove response headers named by the origin's Connection header. Per RFC 9110 Section 7.6.1, an intermediary must remove the header fields listed in a message's Connection header field before forwarding the message, in addition to the well known hop by hop headers, but the proxy() function only removed the well known hop by hop headers, including Connection itself, from origin responses. A client may therefore receive response headers that the origin intended only for its immediate peer, disclosing connection scoped or internal metadata contained in such headers, when an application proxies responses from an origin that declares additional, non standard headers as hop by hop via the Connection response header. This issue is fixed in version 4.12.34."}, {"lang": "es", "value": "Hono es un framework de aplicaci\u00f3n web que proporciona soporte para cualquier entorno de ejecuci\u00f3n de JavaScript. Desde la versi\u00f3n 4.7.0 hasta la 4.12.33, la funci\u00f3n proxy() del Proxy Helper en hono/proxy no elimina los encabezados de respuesta nombrados por el encabezado Connection del origen. Seg\u00fan la Secci\u00f3n 7.6.1 de la RFC 9110, un intermediario debe eliminar los campos de encabezado listados en el campo de encabezado Connection de un mensaje antes de reenviar el mensaje, adem\u00e1s de los encabezados hop by hop bien conocidos, pero la funci\u00f3n proxy() solo elimin\u00f3 los encabezados hop by hop bien conocidos, incluyendo el propio Connection, de las respuestas de origen. Un cliente puede, por lo tanto, recibir encabezados de respuesta que el origen pretend\u00eda solo para su par inmediato, divulgando metadatos internos o con \u00e1mbito de conexi\u00f3n contenidos en dichos encabezados, cuando una aplicaci\u00f3n proxy las respuestas de un origen que declara encabezados adicionales, no est\u00e1ndar, como hop by hop a trav\u00e9s del encabezado de respuesta Connection. Este problema est\u00e1 solucionado en la versi\u00f3n 4.12.34."}], "id": "CVE-2026-71849", "lastModified": "2026-10-24T15:10:00.190", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-71849", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-10T12:02:52.553186Z", "version": "2.0.3"}}]}, "published": "2026-08-07T19:18:54.100", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/honojs/hono/commit/720b566290793d4358bf39843adcb7cf4da4548f"}, {"source": "security-advisories@github.com", "url": "https://github.com/honojs/hono/releases/tag/v4.12.34"}, {"source": "security-advisories@github.com", "url": "https://github.com/honojs/hono/security/advisories/GHSA-79qm-7rj5-m7r9"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.7.0,4.12.34)"}}], "enrichment": {"confidence": 90.0, "confidence_source": "matching", "scores": [{"score": 90.0, "source": "matching"}]}, "original": {"product": "hono", "source": "cna", "vendor": "honojs"}, "product": "hono", "vendor": "hono"}], "created": "2026-08-07T20:45:03.374341+00:00", "updated": "2026-08-08T20:45:17.020820+00:00", "vendors": ["hono", "hono$PRODUCT$hono"]}