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CVE-2026-34041

Nektos Act injection

9.8 CRITICALPublic exploitEPSS 0.74%
  1. Published31 Mar 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Nektos Act< 0.2.86

Remediation

Fixed in
Nektos Act≥ 0.2.86

References

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Frequently asked

Is CVE-2026-34041 being actively exploited?

CVE-2026-34041 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.74%.

How severe is CVE-2026-34041?

CVE-2026-34041 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.74% probability of exploitation.

Which products are affected by CVE-2026-34041?

Affected products include Nektos Act.

How do I fix CVE-2026-34041?

Upgrade affected software to a fixed version, for example Nektos Act 0.2.86 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.