{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/edgelesssys/contrast"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.19.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-59"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-30T20:57:17Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\n\nThe [Kata agent policies](https://docs.edgeless.systems/contrast/architecture/components/policies) generated by the Contrast CLI had an issue in the `CopyFile` verification, which allowed arbitrary writes to the guest root filesytem. A malicious process on the host with the capability to connect to the Kata agent VSOCK could connect to the agent and issue a series of `CopyFile` requests to overwrite security-critical files or trick the workload into disclosing sensitive data, which effectively amounts to a full guest takeover.\n\n### Patches\n\nThis issue has been patched in Contrast v1.19.1.\n\nNote that this fix does not change the fact that host-provided content is generally not trustworthy, as documented.\n\n### Workarounds\n\nIf upgrading is not possible, users can implement the fix in rego and pass it to `contrast generate --policy`. The rego-only fix is a bit trickier than the patch, because the data to check is binary. See the references for details.\n\n### Resources\n\n* Upstream GHSA: https://github.com/kata-containers/kata-containers/security/advisories/GHSA-q49m-57vm-c8cc\n* Alternative policy-only fix: https://gist.github.com/burgerdev/304dd0ab0fff1665b7c27e18a30cf96e",
  "id": "GHSA-rh99-wc69-c255",
  "modified": "2026-04-30T20:57:17Z",
  "published": "2026-04-30T20:57:17Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/edgelesssys/contrast/security/advisories/GHSA-rh99-wc69-c255"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kata-containers/kata-containers/security/advisories/GHSA-q49m-57vm-c8cc"
    },
    {
      "type": "WEB",
      "url": "https://gist.github.com/burgerdev/304dd0ab0fff1665b7c27e18a30cf96e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/edgelesssys/contrast"
    },
    {
      "type": "WEB",
      "url": "https://github.com/edgelesssys/contrast/releases/tag/v1.19.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Contras Affected by CopyFile Policy Subversion via Symlinks"
}