Critical severity9.8NVD Advisory· Published Mar 31, 2026· Updated Apr 6, 2026
CVE-2026-34041
CVE-2026-34041
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/nektos/actGo | < 0.2.86 | 0.2.86 |
Affected products
3- ghsa-coords2 versions
< 0.2.86+ 1 more
- (no CPE)range: < 0.2.86
- (no CPE)range: < 0.0.20260402T184258-150000.1.158.1
Patches
Vulnerability mechanics
References
6- github.com/nektos/act/commit/0c739c8e39c41aa5a07665f732da9cab6df0097anvdPatchWEB
- github.com/nektos/act/security/advisories/GHSA-xmgr-9pqc-h5vwnvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-mfwh-5m23-j46wghsaADVISORY
- github.com/advisories/GHSA-xmgr-9pqc-h5vwghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-34041ghsaADVISORY
- github.com/nektos/act/releases/tag/v0.2.86nvdProductWEB
News mentions
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