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.
History

Thu, 02 Apr 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 01 Apr 2026 02:15:00 +0000

Type Values Removed Values Added
First Time appeared Nektos
Nektos act
Vendors & Products Nektos
Nektos act

Tue, 31 Mar 2026 03:00:00 +0000

Type Values Removed Values Added
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.
Title act: Unrestricted set-env and add-path command processing enables environment injection
Weaknesses CWE-74
References
Metrics cvssV4_0

{'score': 7.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-03-31T01:43:25.074Z

Updated: 2026-04-02T14:49:57.581Z

Reserved: 2026-03-25T15:29:04.744Z

Link: CVE-2026-34041

cve-icon Vulnrichment

Updated: 2026-04-02T14:49:34.731Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-03-31T03:15:58.053

Modified: 2026-04-02T15:16:40.763

Link: CVE-2026-34041

cve-icon Redhat

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