Vulnerability Description
Harden-Runner is a CI/CD security agent that works like an EDR for GitHub Actions runners. In versions 2.15.1 and below, the Harden-Runner that allows bypass of the egress-policy: block network restriction using DNS queries over TCP. Egress policies are enforced on GitHub runners by filtering outbound connections at the network layer. When egress-policy: block is enabled with a restrictive allowed-endpoints list (e.g., only github.com:443), all non-compliant traffic should be denied. However, DNS queries over TCP, commonly used for large responses or fallback from UDP, are not adequately restricted. Tools like dig can explicitly initiate TCP-based DNS queries (+tcp flag) without being blocked. This vulnerability requires the attacker to already have code execution capabilities within the GitHub Actions workflow. The issue has been fixed in version 2.16.0.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Stepsecurity | Harden-Runner | < 2.16.0 |
Related Weaknesses (CWE)
References
- https://github.com/step-security/harden-runner/releases/tag/v2.16.0ProductRelease Notes
- https://github.com/step-security/harden-runner/security/advisories/GHSA-g699-3x6Vendor Advisory
FAQ
What is CVE-2026-32946?
CVE-2026-32946 is a vulnerability with a CVSS score of 2.7 (LOW). Harden-Runner is a CI/CD security agent that works like an EDR for GitHub Actions runners. In versions 2.15.1 and below, the Harden-Runner that allows bypass of the egress-policy: block network restri...
How severe is CVE-2026-32946?
CVE-2026-32946 has been rated LOW with a CVSS base score of 2.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-32946?
Check the references section above for vendor advisories and patch information. Affected products include: Stepsecurity Harden-Runner.