Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nektos | Act | < 0.2.86 |
Related Weaknesses (CWE)
References
- https://github.com/nektos/act/commit/0c739c8e39c41aa5a07665f732da9cab6df0097aPatch
- https://github.com/nektos/act/releases/tag/v0.2.86Product
- https://github.com/nektos/act/security/advisories/GHSA-xmgr-9pqc-h5vwExploitMitigationVendor Advisory
FAQ
What is CVE-2026-34041?
CVE-2026-34041 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 disab...
How severe is CVE-2026-34041?
CVE-2026-34041 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-34041?
Check the references section above for vendor advisories and patch information. Affected products include: Nektos Act.