CVE-2026-67546
- Source
- https://cve.org/CVERecord?id=CVE-2026-67546
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67546.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-67546
- Aliases
-
- GHSA-378x-q589-34mv
- Published
- 2026-11-11T21:41:03Z
- Modified
- 2026-11-12T10:45:39Z
- Severity
-
- 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- Heym: Command execution via POST /api/mcp/fetch-tools stdio transport: supplied command is spawned before MCP validation
- Details
-
Heym builds and runs agentic systems and business-process automations on self-hosted infrastructure. Prior to version 0.0.75, the same POST /api/mcp/fetch-tools endpoint (any authenticated user, lowest role) also accepts the stdio transport, which spawns the attacker-supplied command with attacker-supplied args and an environment merged over os.environ. The process executes on the shared backend host before MCP protocol validation fails — so side effects fire regardless of whether the command speaks MCP. This is a distinct weakness class and exploit primitive from the SSRF (Advisory 2) on the same endpoint, and needs a different fix (role gating / opt-in trust boundary rather than egress controls). This issue has been patched in version 0.0.75.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-94" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67546.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67546.json
- https://github.com/heymrun/heym/commit/22b8ee60eb92128cf4ff04a9b6c0e1b62bf25a01
- https://github.com/heymrun/heym/commit/6c6213f88dfa8b2a70d23a9a271171241e910904
- https://github.com/heymrun/heym/releases/tag/v0.0.75
- https://github.com/heymrun/heym/security/advisories/GHSA-378x-q589-34mv
- https://nvd.nist.gov/vuln/detail/CVE-2026-67546
Affected packages
Git / github.com/heymrun/heym
Affected ranges
- Type
- GIT
- Repo
- https://github.com/heymrun/heym
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "0" }, { "fixed": "0.0.75" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "fixed": "22b8ee60eb92128cf4ff04a9b6c0e1b62bf25a01" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "6c6213f88dfa8b2a70d23a9a271171241e910904" } ], "source": "REFERENCES_COMMIT" }, { "original_tag": "v0.0.75", "range": [ { "fixed": "6c6213f88dfa8b2a70d23a9a271171241e910904" } ], "source": "REFERENCES_TAG" } ] }