CVE-2026-126357

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-126357", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-11-10T21:12:01.227Z", "datePublished": "2026-11-12T22:18:46.437Z", "dateUpdated": "2026-11-12T22:18:46.437Z"}, "containers": {"cna": {"title": "Hono: `mount()` and `app.mount()` can forward a path that bypasses middleware scoped inside the mount prefix", "problemTypes": [{"descriptions": [{"cweId": "CWE-288", "lang": "en", "description": "CWE-288: Authentication Bypass Using an Alternate Path or Channel", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/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-4m76-xfj5-7975", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/honojs/hono/security/advisories/GHSA-4m76-xfj5-7975"}, {"name": "https://github.com/honojs/hono/commit/34f90432a1794b28e52802670efcd01963f716d6", "tags": ["x_refsource_MISC"], "url": "https://github.com/honojs/hono/commit/34f90432a1794b28e52802670efcd01963f716d6"}, {"name": "https://github.com/honojs/hono/releases/tag/v4.13.16", "tags": ["x_refsource_MISC"], "url": "https://github.com/honojs/hono/releases/tag/v4.13.16"}], "affected": [{"vendor": "honojs", "product": "hono", "versions": [{"version": "< 4.13.16", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-12T22:18:46.437Z"}, "descriptions": [{"lang": "en", "value": "Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.13.16, mount() and app.mount() can remove a dynamic mount prefix using the route-pattern length rather than the matched-prefix length, allowing a crafted path to be forwarded as a protected inner route while the outer application routes the original path. Since 4.12.21, rebuilding the forwarded URL from the decoded pathname can also convert a decoded backslash to a slash and collapse parent-directory segments, again causing the mounted application to receive a protected path. An unauthenticated client can use either applicable path transformation to reach a mounted route without authentication or authorization middleware scoped to a subpath inside the mount prefix. This issue is fixed in version 4.13.16."}], "source": {"advisory": "GHSA-4m76-xfj5-7975", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "hono", "vendor": "honojs", "versions": [{"status": "affected", "version": "< 4.13.16"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.13.16, mount() and app.mount() can remove a dynamic mount prefix using the route-pattern length rather than the matched-prefix length, allowing a crafted path to be forwarded as a protected inner route while the outer application routes the original path. Since 4.12.21, rebuilding the forwarded URL from the decoded pathname can also convert a decoded backslash to a slash and collapse parent-directory segments, again causing the mounted application to receive a protected path. An unauthenticated client can use either applicable path transformation to reach a mounted route without authentication or authorization middleware scoped to a subpath inside the mount prefix. This issue is fixed in version 4.13.16."}], "id": "CVE-2026-126357", "lastModified": "2026-11-13T00:20:11.013", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-11-13T00:20:10.873", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/honojs/hono/commit/34f90432a1794b28e52802670efcd01963f716d6"}, {"source": "security-advisories@github.com", "url": "https://github.com/honojs/hono/releases/tag/v4.13.16"}, {"source": "security-advisories@github.com", "url": "https://github.com/honojs/hono/security/advisories/GHSA-4m76-xfj5-7975"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-288"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}