CVE-2026-34041: GO-2026-4891 - act: Unrestricted set-env and add-path command processing enables environment injection in github.com/nektos/act

CVE-2026-34041 · Severity: medium · CVSS 4 · Published 2026-04-02

act: Unrestricted set-env and add-path command processing enables environment injection in github.com/nektos/act

Technologies: github.com/nektos/act (Go). Vendors: Go.

Quick answers

Is CVE-2026-34041 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-34041 being exploited in the wild.
How severe is CVE-2026-34041?
Medium severity, with a CVSS score of 4, published 2 April 2026.
Which products and versions are affected?
github.com/nektos/act (Go) SEMVER:introduced=0,fixed=0.2.86.
Is there a fix for CVE-2026-34041?
Yes. github.com/nektos/act (Go): upgrade to 0.2.86 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-34041?
Check whether you run github.com/nektos/act (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/nektos/act (Go): upgrade to 0.2.86 or later
    go get github.com/nektos/act@v0.2.86

Affected products

  • github.com/nektos/act (Go) SEMVER:introduced=0,fixed=0.2.86

Identifiers

  • CVE-2026-34041
  • GHSA-xmgr-9pqc-h5vw
  • GO-2026-4891

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