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.
INFO
Published Date :
2026-03-20T03:58:40.557Z
Last Modified :
2026-03-20T15:47:42.018Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-32946 vulnerability.
| Vendors | Products |
|---|---|
| Step Security |
|
| Stepsecurity |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-32946.
