CVE-2026-29045

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3	Patch
https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*

History

No history.

Information

Published : 2026-03-04 23:16

Updated : 2026-03-06 18:06

NVD link : CVE-2026-29045

Mitre link : CVE-2026-29045

CVE.ORG link : CVE-2026-29045

JSON object : View

Products Affected

hono

hono

CWE

CWE-177

Improper Handling of URL Encoding (Hex Encoding)

{"id": "CVE-2026-29045", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"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"}, "impactScore": 3.6, "exploitabilityScore": 3.9}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "published": "2026-03-04T23:16:10.247", "references": [{"url": "https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-177"}]}], "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."}], "lastModified": "2026-03-06T18:06:45.650", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "8ADA9966-4575-41CC-8905-E1F4E4CB5CA6", "versionEndExcluding": "4.12.4"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}