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CVE-2026-34042

8.2 · HIGH

act is a project which allows for local running of github actions.

Published Mar 31, 2026CWE-862EPSS 0.58%

Overview

CVE-2026-34042 is a high-severity vulnerability. It was published on March 31, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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 the internet to create caches with arbitrary keys and retrieve all existing caches. If they can predict which cache keys will be used by local actions, they can create malicious caches containing whatever files they please most likely allowing arbitrary remote code execution within the docker container. This issue has been patched in version 0.2.86.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refcode.forgejo.org/forgejo/runner/issues/294GitHubgithub.com/nektos/act/commit/c28c27e141e8b54f9853de82f421ee09846751f7GitHubgithub.com/nektos/act/releases/tag/v0.2.86GitHubgithub.com/nektos/act/security/advisories/GHSA-x34h-54cw-9825

How CyberStrike helps

Frequently asked questions

What is CVE-2026-34042?

CVE-2026-34042 is a high-severity vulnerability. It was published on March 31, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-34042?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-34042?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-34042?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-34042 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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