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Vulnerability record · CVE-2026-29045 · published 4 March 2026

CVE-2026-29045: Hono vulnerability

Hono · Hono

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.

9.8 CVSS 3.1 Critical EPSS 0.60% · top 53.5% CWE-177 · CWE-177
9.8CVSS 3.1 base score
0.60%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.1CVE-2025-62610Hono improper authorization vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. In versions from 1.1.0 to before 4.10.2, Hono’s JWT Auth Middle…EPSS 0.38%7.5CVE-2026-27700Hono authentication bypass by spoofing vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. In versions 4.12.0 and 4.12.1, when using the AWS Lambda adapte…EPSS 0.34%7.5CVE-2025-58362Hono vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. Versions 4.8.0 through 4.9.5 contain a flaw in the getPath util…EPSS 0.53%6.5CVE-2026-59896Hono race condition vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. From 4.11.8 before 4.12.27, hono/jsx did not isolate context va…EPSS 0.30%6.5CVE-2026-47673Hono improper authorization vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the jwt and jwk middlewares do not verify tha…EPSS 0.25%6.5CVE-2026-44456Hono uncontrolled resource consumption vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.16, bodyLimit() does not reliably enforce maxSize…EPSS 0.28%6.5CVE-2026-29085Hono injection vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, when using streamSSE() in Streaming He…EPSS 0.29%6.5CVE-2026-24398Hono vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.11.7, IP Restriction Middleware in Hono is v…EPSS 0.35%

Source: NIST National Vulnerability Database (record CVE-2026-29045), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.