Is CVE-2026-109955 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-109955?

CVE-2026-109955 has a CVSS v3 severity of MEDIUM (5.3).

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CVE-2026-109955

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.