CVE-2026-29045

CRITICAL EPSS 35.0%
Published Mar 4, 20263mo ago · Modified Jun 17, 20261w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Mar 4, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago

Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, when using serveStatic together with route-based middleware protections (e.g. app.use('/admin/*', ...)), inconsistent URL decoding allowed protected static resources to be accessed without authorization. The router used decodeURI, while serveStatic used decodeURIComponent. This mismatch allowed paths containing encoded slashes (%2F) to bypass middleware protections while still resolving to the intended filesystem path. This issue has been patched in version 4.12.4.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
35.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-177

Affected Products 1

VendorProductVersionRange
honohono* <4.12.4

References 2

  • github.com https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3
    Patch
  • github.com https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr
    Vendor Advisory

Remediation

  • github.com https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3
    Patch