Bug 2550544 (CVE-2026-109955) - CVE-2026-109955 hono: hono: Security bypass via double path decoding
Summary: CVE-2026-109955 hono: hono: Security bypass via double path decoding
Keywords:
Status: NEW
Alias: CVE-2026-109955
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-13 14:01 UTC by OSIDB Bzimport
Modified: 2026-10-16 09:22 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Description OSIDB Bzimport 2026-10-13 14:01:00 UTC 
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.
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