CVE-2026-109955

Hono 4.12.4 before 4.13.11 Middleware Bypass via serveStatic Double Decoding

Published Oct 13, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Hono 4.12.4 before 4.13.11 Middleware Bypass via serveStatic Double Decoding
First Time appeared Hono
Hono hono
Weaknesses CWE-174
CPEs cpe:2.3:a:hono:hono:*:*:*:*:*:*:*:*
Vendors & Products Hono
Hono hono
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

cvssV4_0

{'score': 6.9, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 13, 2026, 1:51 PM
Reserved
Oct 13, 2026, 11:25 AM
Status
Deferred
Published
Oct 13, 2026, 2:17 PM
Modified
Oct 13, 2026, 2:17 PM
Severity
Moderate
Public date
Oct 13, 2026, 1:27 PM