All vulnerabilities
CVE-2026-109955CVE-2026-111757GHSA-5r4p-p66f-jhc7

Hono 4.12.4 before 4.13.11 Middleware Bypass via serveStatic Double Decoding

honojs hononpmLibraries & packages
Open in ThreatlineRecord JSON
CVSS
6.9Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.31%Chance of exploitation activity in the next 30 days, higher than 23% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in4.13.11Fixed versionCVE List
Published13 Oct 2026Updated 20 Oct 2026CVE List

What fixes it

  • 4.13.11honoCVE List
  • 4.13.11hono, npmOSVnpm install hono@4.13.11

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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.

Text from CVE List

Affected versions 3

  • honoaffected: 4.12.4 before 4.13.11CVE List
  • honounaffected: 4.13.11CVE List
  • hono, npmfrom 4.12.4, fixed in 4.13.11OSV

References 2