Is CVE-2026-29045 actively exploited?

No active exploitation of CVE-2026-29045 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-29045 be exploited remotely?

Yes. CVE-2026-29045 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-29045?

CVE-2026-29045 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2026-29045

CWE-177Published: March 4, 2026· Updated: Mar 6, 2026

9.8

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.6th

Official 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.

NVD Source

Technical Analysis

CVE-2026-29045 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.