What is CVE-2026-34042?

CVE-2026-34042 is a high-severity vulnerability in Nektos Act, classified under Missing Authorization. CVSS score: 8.2/10. Published 2026-03-31.

How severe is CVE-2026-34042?

High severity. CVSS v3 base score is 8.2 out of 10.

Auth bypass in Nektos Act

CVE-2026-34042

act is a project which allows for local running of github actions. Prior to version 0.2.86, act's built in actions/cache server listens to connections on all interfaces and allows anyone who can connect to it including someone anywhere on…

Vulnerability class: Broken Access Control

EPSS: 0.000 (6.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N.

Affected products

Nektos Act — versions < 0.2.86

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

https://github.com/nektos/act/security/advisories/GHSA-x34h-54cw-9825 (x_refsource_CONFIRM)
https://github.com/nektos/act/commit/c28c27e141e8b54f9853de82f421ee09846751f7 (x_refsource_MISC)
https://code.forgejo.org/forgejo/runner/issues/294 (x_refsource_MISC)
https://github.com/nektos/act/releases/tag/v0.2.86 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-34042?: CVE-2026-34042 is a high-severity vulnerability in Nektos Act, classified under Missing Authorization. CVSS score: 8.2/10. Published 2026-03-31.
How severe is CVE-2026-34042?: High severity. CVSS v3 base score is 8.2 out of 10.