CVE-2026-109955

CVSS 6.9 (medium) · published 2026-10-13

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 paths that the router matches in encoded form, reaching static files without authentication checks running.

Weakness: CWE-174

Source: NVD CVE-2026-109955

References

• https://github.com/honojs/hono/security/advisories/GHSA-5r4p-p66f-jhc7
• https://www.vulncheck.com/advisories/hono-4.12.4-before-4.13.11-middleware-bypass-via-servestatic-double-decoding

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