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High severityNVD Advisory· Published Mar 4, 2026· Updated Mar 5, 2026

Hono: Arbitrary file access via serveStatic vulnerability

CVE-2026-29045

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
hononpm
< 4.12.44.12.4

Affected products

15

Patches

Vulnerability mechanics

References

4

News mentions

0

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