CVE-2026-34041

CRITICAL

9.8

Description

act is a project which allows for local running of github actions. Prior to version 0.2.86, act unconditionally processes the deprecated ::set-env:: and ::add-path:: workflow commands, which was disabled due to environment injection risks. When a workflow step echoes untrusted data to stdout, an attacker can inject these commands to set arbitrary environment variables or modify the PATH for all subsequent steps in the job. This issue has been patched in version 0.2.86.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/31/2026

Last Modified4/2/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-74

References

https://github.com/nektos/act/commit/0c739c8e39c41aa5a07665f732da9cab6df0097a(security-advisories@github.com)

https://github.com/nektos/act/releases/tag/v0.2.86(security-advisories@github.com)

https://github.com/nektos/act/security/advisories/GHSA-xmgr-9pqc-h5vw(security-advisories@github.com)

IOC Correlations

No correlations recorded

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