Bug 2550544 (CVE-2026-109955)

Summary: CVE-2026-109955 hono: hono: Security bypass via double path decoding
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dschmidt, ikhan, jlanda, jwong, kshier, lchilton, omaciel, rbobbitt, rhel-process-autobot, rjohnson, sdawley, sfeifer, simaishi, stcannon, ttakamiy, watson-tool-maintainers, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in Hono. A remote, unauthenticated attacker can exploit a double path decoding issue in the serveStatic component by submitting requests with specially crafted, encoded URL paths. This flaw allows attackers to bypass security middleware, granting unauthorized access to protected static files without undergoing authentication checks.
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

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.