{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "fa2e9d605c4eeb9fcad4c99c224cee0c6c7f3594"
            }
          ],
          "repo": "https://github.com/step-security/harden-runner",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-g699-3x6g-wm3g"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-693",
      "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32946.json"
  },
  "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.",
  "id": "CVE-2026-32946",
  "modified": "2026-04-01T23:08:54.759056178Z",
  "published": "2026-03-20T03:58:40.557Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/step-security/harden-runner/releases/tag/v2.16.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32946.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/step-security/harden-runner/security/advisories/GHSA-g699-3x6g-wm3g"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32946"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Egress Policy Bypass via DNS over TCP in Harden-Runner (Community Tier)"
}