{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-67542", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-29T18:47:17.074Z", "datePublished": "2026-11-11T21:39:24.809Z", "dateUpdated": "2026-11-11T21:39:24.809Z"}, "containers": {"cna": {"title": "Heym: SSRF via POST /api/mcp/fetch-tools: any authenticated user reaches local/private URLs through the SSE and streamable-HTTP transports", "problemTypes": [{"descriptions": [{"cweId": "CWE-918", "lang": "en", "description": "CWE-918: Server-Side Request Forgery", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/heymrun/heym/security/advisories/GHSA-jjvx-3wfc-p8hq", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/heymrun/heym/security/advisories/GHSA-jjvx-3wfc-p8hq"}, {"name": "https://github.com/heymrun/heym/commit/72954f1f6264f6260bc1148b09ca10d613992b64", "tags": ["x_refsource_MISC"], "url": "https://github.com/heymrun/heym/commit/72954f1f6264f6260bc1148b09ca10d613992b64"}, {"name": "https://github.com/heymrun/heym/releases/tag/0.0.70", "tags": ["x_refsource_MISC"], "url": "https://github.com/heymrun/heym/releases/tag/0.0.70"}], "affected": [{"vendor": "heymrun", "product": "heym", "versions": [{"version": "< 0.0.70", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-11T21:39:24.809Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-jjvx-3wfc-p8hq", "discovery": "UNKNOWN"}}}}

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