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

Hono: `serveStatic` decodes the request path a second time, leading to bypass of middleware on static paths

honojs hononpmLibraries & packages
Open in ThreatlineRecord JSON
CVSS
5.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.22%Chance of exploitation activity in the next 30 days, higher than 12% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in4.13.11Fixed versionGitHub
Published19 Oct 2026Updated 20 Oct 2026CVE List

What fixes it

  • 4.13.11hono, npmGitHubnpm 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

Summary

serveStatic decodes the request path a second time after Hono has already decoded it for routing. A crafted request can be routed as one path and served as another, so middleware mounted on a static prefix does not run for a file under that prefix.

Details

Hono decodes the request path once before routing. serveStatic decoded it again before resolving the file. With a malformed percent-encoded sequence, the first decode leaves part of the path encoded, the router matches the encoded form, and the second decode resolves the real directory. The file is still resolved inside the configured root; this is not a traversal outside it.

Impact

An unauthenticated attacker may reach static files without the middleware on their prefix running, for example an authentication check. This affects applications that mount middleware on part of the directory served by serveStatic. Applications that serve only public files are not affected.

Text from GitHub Advisory Database

Affected versions 3

  • hono, npm>= 4.12.4, < 4.13.11GitHub
  • honoaffected: >= 4.12.4, < 4.13.11CVE List
  • hono, npmfrom 4.12.4, fixed in 4.13.11OSV

References 5