Is CVE-2026-39408 actively exploited?

No active exploitation of CVE-2026-39408 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-39408 be exploited remotely?

Yes. CVE-2026-39408 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-39408?

CVE-2026-39408 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-39408

HIGH

CVE-2026-39408

CWE-22Published: April 8, 2026· Updated: Apr 10, 2026

7.5

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:4.4th

Official Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a path traversal issue in toSSG() allows files to be written outside the configured output directory during static site generation. When using dynamic route parameters via ssgParams, specially crafted values can cause generated file paths to escape the intended output directory. This vulnerability is fixed in 4.12.12.

NVD Source

Technical Analysis

CVE-2026-39408 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), with a CVSS base score of 7.5.