CVE-2026-109955CWE-174

CVE-2026-109955

Medium · published October 13, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
23.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00314 · 23.2th percentile
Weakness
CWE-174 · Double Decoding of the Same Data
Published
2026-10-13T18:17Z
References (2)
https://github.com/honojs/hono/security/advisories/GHSA-5r4p-p66f-jhc7 · [email protected]https://www.vulncheck.com/advisories/hono-4.12.4-before-4.13.11-middleware-bypass-via-servestatic-double-decoding · [email protected]
EPSS history
Timeline
  • 15 OCT 03:28Z
    EPSS moved — → 0%
    epss
  • 13 OCT 13:27Z
    Hono 4.12.4 before 4.13.11 Middleware Bypass via serveStatic Double Decoding
    cvelistv5
  • 13 OCT 13:27Z
    Hono 4.12.4 before 4.13.11 Middleware Bypass via serveStatic Double Decoding
    cvelistv5