Delimiter injection vulnerability in @actions/core exportVariable

{
  "id": "a2292bb8992ccd55293ffd64a209eed7f7f3d179897cae5273d3050c86f740ba",
  "url": "https://osv.dev/vulnerability/CVE-2022-35954",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Delimiter injection vulnerability in @actions/core exportVariable",
    "summary": "The GitHub Actions ToolKit provides a set of packages to make creating actions easier. The `core.exportVariable` function uses a well known delimiter that attackers can use to break out of that specific variable and assign values to other arbitrary variables. Workflows that write untrusted values to the `GITHUB_ENV` file may cause the path or other environment variables to be modified without the intention of the workflow or action author. Users should upgrade to `@actions/core v1.9.1`. If you are unable to upgrade the `@actions/core` package, you can modify your action to ensure that any user input does not contain the delimiter `_GitHubActionsFileCommandDelimeter_` before calling `core.exportVariable`.",
    "evidence": "osv:CVE-2022-35954",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2022-35954",
      "aliases": [
        "CVE-2022-35954",
        "GHSA-7r3h-m5j6-3q42"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/actions/toolkit",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4beda9cbc00ba6eefe387a937c21087ccb8ee9df"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "4beda9cbc00ba6eefe387a937c21087ccb8ee9df"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "@actions/tool-cache@1.1.1",
            "@actions/io@1.0.1",
            "@actions/github@1.1.0",
            "@actions/exec@1.0.1",
            "@actions/core@1.1.0",
            "@actions/tool-cache@1.0.0",
            "@actions/io@1.0.0",
            "@actions/github@1.0.0",
            "@actions/exec@1.0.0",
            "@actions/core@1.0.0",
            "0.0.2",
            "0.0.1",
            "0.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-35954.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.275843549Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/35xxx/CVE-2022-35954.json",
        "https://github.com/actions/toolkit/security/advisories/GHSA-7r3h-m5j6-3q42",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-35954",
        "https://github.com/actions/toolkit/commit/4beda9cbc00ba6eefe387a937c21087ccb8ee9df"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-77"
        ],
        "cna_assigner": "GitHub_M",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "1.9.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/35xxx/CVE-2022-35954.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-35954",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492827,
  "published_at": "2022-08-13T23:40:09+00:00"
}