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TI-2026-23231 Aliases CVE-2026-29087GHSA-wc8c-qw6v-h7f6

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

Priority LOW 39CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.

Summary

@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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00363 30th percentileScored 2026-11-07
Fix Fixed node-server (honojs): 1.19.10@hono/node-server (npm): 1.19.10

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
honojsnode-serverbefore 1.19.101.19.10Patch availableCNA
—@hono/node-server (npm)before 1.19.101.19.10Patch availableGHSA-wc8c-qw6v-h7f6
  • node-server Vendorhonojs Affected before 1.19.10 Fixed in 1.19.10 Patch available CNA
  • @hono/node-server (npm) Vendor— Affected before 1.19.10 Fixed in 1.19.10 Patch available GHSA-wc8c-qw6v-h7f6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:hono:node-server:*:*:*:*:*:node.js:*:*before 1.19.10Vulnerablehonojs
  • cpe:2.3:a:hono:node-server:*:*:*:*:*:node.js:*:* Versions before 1.19.10 Vulnerable ·honojs

Remediation

  • Fix · CNA node-server (honojs) Fixed in 1.19.10
  • Fix · GHSA-wc8c-qw6v-h7f6 @hono/node-server (npm) Fixed in 1.19.10 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-29087
  2. 2026-10-03 Alias added: GHSA-wc8c-qw6v-h7f6

References

Patch 1

Advisory 2

Other 1

  • TI-2024-15441 @hono/node-server can't handle "double dots" in URL CVSS 3.1MEDIUM 5.3
  • TI-2024-21534 @hono/node-server contains Denial of Service risk when receiving Host header that cannot be parsed CVSS 3.1HIGH 7.5
  • TI-2026-28388 @hono/node-server has a middleware bypass via repeated slashes in serveStatic CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences