CVE-2026-32946
- Source
- https://cve.org/CVERecord?id=CVE-2026-32946
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-32946.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-32946
- Aliases
- Published
- 2026-03-20T03:58:40.557Z
- Modified
- 2026-04-10T05:42:32.264672Z
- Severity
-
- 4.6 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N CVSS Calculator
- Summary
- Egress Policy Bypass via DNS over TCP in Harden-Runner (Community Tier)
- Details
-
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.
- Database specific
{ "cwe_ids": [ "CWE-693", "CWE-863" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32946.json", "cna_assigner": "GitHub_M" }- References
Affected packages
Git / github.com/step-security/harden-runner
Affected ranges
- Type
- GIT
- Repo
- https://github.com/step-security/harden-runner
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed