Vulnerability Details CVE-2026-34041
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 18.5%
CVSS Severity
CVSS v3 Score 9.8
References