How severe is CVE-2026-29087?

CVE-2026-29087 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-29087 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-29087?

CVE-2026-29087 affects Hono Node-server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-29087?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-29087 have an EU (EUVD) identifier?

Yes. CVE-2026-29087 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10047.

When was CVE-2026-29087 published?

CVE-2026-29087 was published on 2026-03-06 and last updated on 2026-06-17.

CVE-2026-29087

CVE-2026-29087 is a high-severity vulnerability in Hono Node-server with a CVSS 3.x base score of 7.5. 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-863.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10047
Weakness: CWE-863
Affected product: Hono Node-server
Published: 2026-03-06
Last modified: 2026-06-17

Description

@hono/node-server allows running the Hono application on Node.js. Prior to version 1.19.10, when using @hono/node-server's static file serving together with route-based middleware protections (e.g. protecting /admin/*), inconsistent URL decoding can allow protected static resources to be accessed without authorization. In particular, paths containing encoded slashes (%2F) may be evaluated differently by routing/middleware matching versus static file path resolution, enabling a bypass where middleware does not run but the static file is still served. This issue has been patched in version 1.19.10.

Frequently asked questions

What is CVE-2026-29087?: @hono/node-server allows running the Hono application on Node.js. Prior to version 1.19.10, when using @hono/node-server's static file serving together with route-based middleware protections (e.g. protecting /admin/*), inconsistent URL decoding can allow protected static resources to be accessed without authorization. In particular, paths containing encoded slashes (%2F) may be evaluated differently by routing/middleware matching versus static file path resolution, enabling a bypass where middleware does not run but the static file is still served. This issue has been patched in version 1.19.10.
How severe is CVE-2026-29087?: CVE-2026-29087 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-29087 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-29087?: CVE-2026-29087 affects Hono Node-server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-29087?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-29087 have an EU (EUVD) identifier?: Yes. CVE-2026-29087 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10047.
When was CVE-2026-29087 published?: CVE-2026-29087 was published on 2026-03-06 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Hono Node-server

CVE-2024-32652 — High (CVSS 7.5): The adapter @hono/node-server allows you to run your Hono application on Node.js. Prior to 1.10.1, the application…
CVE-2026-39406 — 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…
CVE-2024-23340 — Medium (CVSS 5.3): @hono/node-server is an adapter that allows users to run Hono applications on Node.js. Since v1.3.0, @hono/node-server…

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