{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "0.0.70"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "72954f1f6264f6260bc1148b09ca10d613992b64"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "0.0.70",
                "range": [
                  {
                    "fixed": "b67e9efb6623385125347b2610e422d18f1c82fa"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "b67e9efb6623385125347b2610e422d18f1c82fa"
            },
            {
              "fixed": "72954f1f6264f6260bc1148b09ca10d613992b64"
            }
          ],
          "repo": "https://github.com/heymrun/heym",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-jjvx-3wfc-p8hq"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67542.json"
  },
  "details": "Heym builds and runs agentic systems and business-process automations on self-hosted infrastructure. Prior to version 0.0.70, POST /api/mcp/fetch-tools is reachable by any authenticated user (lowest role; no admin/workflow association) and fetches an attacker-supplied URL through the sse and streamable_http transports with no scheme / private-IP / allowlist / redirect guard. The transport error is reflected in the HTTP 422 response, giving a semi-blind SSRF oracle, and the attacker also controls the outbound request headers. This issue has been patched in version 0.0.70.",
  "id": "CVE-2026-67542",
  "modified": "2026-11-13T02:30:42.591700334Z",
  "published": "2026-11-11T21:39:24.809Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/heymrun/heym/releases/tag/0.0.70"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67542.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/heymrun/heym/security/advisories/GHSA-jjvx-3wfc-p8hq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67542"
    },
    {
      "type": "FIX",
      "url": "https://github.com/heymrun/heym/commit/72954f1f6264f6260bc1148b09ca10d613992b64"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Heym: SSRF via POST /api/mcp/fetch-tools: any authenticated user reaches local/private URLs through the SSE and streamable-HTTP transports"
}