CVE-2026-39406: @hono/node-server allows running the Hono application on Node.js

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-39406 is a medium-severity flaw (CVSS 5.3) affecting node-server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

@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. T

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-04-08
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: hono

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-08 15:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

hono node-server UPGRADE

Affected: <= 1.19.12

Fixed in: newer than 1.19.12

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls node-server

2. UPGRADE to newer than 1.19.12

npm install node-server@">1.19.12"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39406?

node-server: upgrade to newer than 1.19.12. Exact commands for each OS are on this page.

Is CVE-2026-39406 being exploited?

CVE-2026-39406 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39406 affect?

CVE-2026-39406 affects node-server. Severity is medium (CVSS 5.3). @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-bas

How urgent is CVE-2026-39406?

Priority 31/100. Remotely exploitable, no login, no user action

Software pages

Node.js vulnerabilities

References

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