Is there a public exploit for CVE-2026-39406?

No public exploit for CVE-2026-39406 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-39406?

CVE-2026-39406 scores CVSS 5.3 (v3.1), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.38%.

What does CVE-2026-39406 affect?

CVE-2026-39406 affects honojs node-server.

5.3 Medium

@hono/node-server allows running the Hono application on Node.js.

CVE-2026-39406

@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.

Assessment

CVSS: 5.3 (v3.1)
Severity: Medium
EPSS: 0.38% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 8 April 2026
Last updated: 24 July 2026
Affected: honojs · node-server
Weakness: CWE-22
Assigner: security-advisories@github.com

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

At the source

References

https://github.com/honojs/node-server/security/advisories/GHSA-92pp-h63x-v22m

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