{"id":"CVE-2026-67542","summary":"Heym: SSRF via POST /api/mcp/fetch-tools: any authenticated user reaches local/private URLs through the SSE and streamable-HTTP transports","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.","aliases":["GHSA-jjvx-3wfc-p8hq"],"modified":"2026-11-13T02:47:36.396360746Z","published":"2026-11-11T21:39:24.809Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67542.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-918"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/heymrun/heym","events":[{"introduced":"0"},{"fixed":"b67e9efb6623385125347b2610e422d18f1c82fa"},{"fixed":"72954f1f6264f6260bc1148b09ca10d613992b64"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0"},{"fixed":"0.0.70"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"range":[{"fixed":"72954f1f6264f6260bc1148b09ca10d613992b64"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"b67e9efb6623385125347b2610e422d18f1c82fa"}],"source":"REFERENCES_TAG","original_tag":"0.0.70"}]}}],"versions":["v0.0.58","v0.0.57","v0.0.56","v0.0.55","v0.0.54","v0.0.53","v0.0.52","v0.0.51","v0.0.50","v.0.0.49","v0.0.48","v0.0.47","v0.0.46","v0.0.45","v0.0.44","v0.0.43","v0.0.42","v0.0.41","v0.0.40","v0.0.39","v0.0.38","v0.0.37","v0.0.36","v0.0.35","v0.0.34","v0.0.33","v0.0.32","v0.0.31","v0.0.30","v0.0.29","v0.0.27","v0.0.26","v0.0.25","v0.0.24","v0.0.23","v0.0.22","v0.0.21","v0.0.20","v0.0.19","v0.0.18","v0.0.17","v0.0.16","v0.0.15","v0.0.14","v0.0.13","v0.0.12","v0.0.11","v0.0.10","v0.0.9","v0.0.8","v0.0.7","v0.0.6","v0.0.5","v0.0.4","v0.0.3","v0.0.2","v0.0.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67542.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N"}]}