{"id":"CVE-2026-109955","title":"Hono from 4.12.4 before 4.13.11 contains a middleware bypass vulnerability in serveStatic that allows unauthenticated attackers to skip prefix middleware by exploiting double path decoding","summary":"Hono from 4.12.4 before 4.13.11 contains a middleware bypass vulnerability in serveStatic that allows unauthenticated attackers to skip prefix middleware by exploiting double path decoding. Attackers can send malformed percent-encoded pa…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-174","CWE-551"],"published":"2026-10-13","updated":"2026-10-13","sourceUpdated":"2026-10-13T14:17:34.467","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109955","references":[{"url":"https://github.com/honojs/hono/security/advisories/GHSA-5r4p-p66f-jhc7","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/hono-4.12.4-before-4.13.11-middleware-bypass-via-servestatic-double-decoding","label":"disclosure@vulncheck.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109955.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-109955"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2550544"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-109955"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109955"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-10-13T14:29:01.854Z","vendor":"honojs","product":"hono","affected":["hono >= 4.12.4 < 4.13.11"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-13T13:51:31.306804Z"},"epss":0.00315,"epssPercentile":0.24239,"slug":"CVE-2026-109955","body":"## Overview\n\nHono from 4.12.4 before 4.13.11 contains a middleware bypass vulnerability in serveStatic that allows unauthenticated attackers to skip prefix middleware by exploiting double path decoding. Attackers can send malformed percent-encoded paths that the router matches in encoded form, reaching static files without authentication checks running.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Migration Toolkit for Applications 8, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux 10, Red Hat Hardened Images, Red Hat OpenShift AI (RHOAI), Red Hat OpenShift Dev Spaces · no fix planned: Migration Toolkit for Applications 8, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux 10, Red Hat OpenShift AI (RHOAI), … · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109955.json)","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}