What’s Vulnerable › Vulnerabilities

CVE-2026-29087: @hono/node-server: Authorization bypass for protected static paths via encoded slashes in Serve Static Middleware

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-06 · updated 2026-06-17
• Weakness: CWE-863

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.

Affected products

• honojs node-server: before 1.19.10 — fixed in 1.19.10

How to fix

Upgrade to a fixed version: honojs node-server 1.19.10. Check the vendor advisory for mitigations.

References

• https://github.com/honojs/node-server/commit/455015be1697dd89974a68b70350ea7b2d126d2e
• https://github.com/honojs/node-server/security/advisories/GHSA-wc8c-qw6v-h7f6

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