Is CVE-2026-39406 actively exploited?

No active exploitation of CVE-2026-39406 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-39406 be exploited remotely?

Yes. CVE-2026-39406 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-39406?

CVE-2026-39406 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-39406

CWE-22Published: April 8, 2026· Updated: Apr 8, 2026

5.3

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.6th

Official Description

@hono/node-server allows running the Hono application on Node.js. Prior to 1.19.13, a path handling inconsistency in serveStatic allows protected static files to be accessed by using repeated slashes (//) in the request path. When route-based middleware (e.g., /admin/*) is used for authorization, the router may not match paths containing repeated slashes, while serveStatic resolves them as normalized paths. This can lead to a middleware bypass. This vulnerability is fixed in 1.19.13.

NVD Source

Technical Analysis

CVE-2026-39406 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.