Contrast before 1.19.1 CopyFile Policy Symlink Subversion

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-100838",
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "dateUpdated": "2026-09-27T01:28:35.498Z",
    "dateReserved": "2026-09-26T23:23:03.411Z",
    "datePublished": "2026-09-27T01:28:35.498Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck",
        "dateUpdated": "2026-09-27T01:28:35.498Z"
      },
      "datePublic": "2026-04-23T00:00:00.000Z",
      "title": "Contrast before 1.19.1 CopyFile Policy Symlink Subversion",
      "descriptions": [
        {
          "lang": "en",
          "value": "Contrast is a confidential-computing runtime for Kubernetes. In versions before 1.19.1, the Kata agent policies generated by the Contrast CLI contained a flaw in the CopyFile verification that allowed arbitrary writes to the guest root filesystem. A malicious process on the untrusted host able to connect to the Kata agent VSOCK could issue a series of CopyFile requests to overwrite security-critical files in the guest or trick the workload into disclosing sensitive data, effectively amounting to a full guest takeover. Users unable to upgrade can apply an equivalent rego policy fix passed to 'contrast generate --policy'."
        }
      ],
      "affected": [
        {
          "vendor": "edgelesssys",
          "product": "contrast",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "1.19.1"
            },
            {
              "version": "1.19.1",
              "status": "unaffected",
              "versionType": "semver"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "Improper Link Resolution Before File Access ('Link Following')",
              "cweId": "CWE-59",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/edgelesssys/contrast/security/advisories/GHSA-rh99-wc69-c255",
          "name": "GitHub Security Advisory (GHSA-rh99-wc69-c255)",
          "tags": [
            "vendor-advisory"
          ]
        },
        {
          "url": "https://www.vulncheck.com/advisories/contrast-before-1.19.1-copyfile-policy-symlink-subversion",
          "name": "VulnCheck Advisory: Contrast before 1.19.1 CopyFile Policy Symlink Subversion",
          "tags": [
            "third-party-advisory"
          ]
        }
      ],
      "metrics": [
        {
          "format": "CVSS"
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "attackVector": "ADJACENT_NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "NONE",
            "userInteraction": "NONE",
            "scope": "UNCHANGED",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH"
          }
        }
      ]
    }
  }
}