How severe is CVE-2026-39406?

CVE-2026-39406 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-39406 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39406?

CVE-2026-39406 affects Hono Node-server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39406?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-39406 have an EU (EUVD) identifier?

Yes. CVE-2026-39406 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20491.

When was CVE-2026-39406 published?

CVE-2026-39406 was published on 2026-04-08 and last updated on 2026-06-17.

CVE-2026-39406

CVE-2026-39406 is a medium-severity vulnerability in Hono Node-server with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20491
Weakness: CWE-22
Affected product: Hono Node-server
Published: 2026-04-08
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-39406?: CVE-2026-39406 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-39406 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39406?: CVE-2026-39406 affects Hono Node-server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39406?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-39406 have an EU (EUVD) identifier?: Yes. CVE-2026-39406 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20491.
When was CVE-2026-39406 published?: CVE-2026-39406 was published on 2026-04-08 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:hono:node-server:*:*:*:*:*:node.js:*:*

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