{"id":"CVE-2026-77339","summary":"Process Compose: Browser DNS rebinding lets websites control local process-compose MCP tools","details":"Process Compose is a scheduler and orchestrator for non-containerized applications. Prior to 1.120.0, the MCP SSE listener in src/mcp/server.go accepts browser-origin requests to /sse and the returned message endpoint without validating the Host header, validating the Origin header, or authenticating the caller. When MCP SSE is enabled, a malicious website can use DNS rebinding to reach the loopback listener and issue MCP requests. If expose_control_tools is enabled, the attacker can enumerate process state, read or search logs, truncate logs, and start, stop, restart, or scale local processes; configured user-defined tools can expose additional commands and output. The Gin REST API token middleware does not protect this separately started MCP listener. This issue is fixed in version 1.120.0.","aliases":["GHSA-5gm3-9crp-6g3v"],"modified":"2026-09-20T11:47:26.965310560Z","published":"2026-09-18T16:37:19.072Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77339.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-306","CWE-346"]},"references":[{"type":"WEB","url":"https://github.com/F1bonacc1/process-compose/releases/tag/v1.120.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77339.json"},{"type":"ADVISORY","url":"https://github.com/F1bonacc1/process-compose/security/advisories/GHSA-5gm3-9crp-6g3v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77339"},{"type":"FIX","url":"https://github.com/F1bonacc1/process-compose/commit/6ffa74f462cd2fa4f8dc1ee63c70b793b298c858"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/f1bonacc1/process-compose","events":[{"introduced":"0"},{"fixed":"6ffa74f462cd2fa4f8dc1ee63c70b793b298c858"},{"fixed":"0f3a8e6868f592f044a2ecd9387ff3025825ad46"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.120.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v1.116.0","v1.110.0","v1.103.0","v1.100.0","v1.94.0","v1.90.0","v1.87.0","v1.85.0","v1.78.0","v1.76.1","v1.76.0","v1.75.2","v1.75.0","v1.73.0","v1.64.1","v1.63.0","v1.46.0","v1.40.1","v1.34.0","v1.27.0","v1.24.2","v1.24.0","v1.18.0","v1.9.0","v1.6.1","v1.5.0","v1.2.0","v1.0.1","v1.0.0","v0.88.0","v0.85.0","v0.81.4","v0.80.0","v0.77.8","v0.77.4","v0.75.1","v0.75.0","v0.69.0","v0.65.1","v0.60.0","v0.51.4","v0.51.0","v0.45.0","v0.43.1","v0.40.2","v0.40.1","v0.40.0","v0.29.7","v0.29.5","v0.29.4","v0.29.1","v0.29.0","v0.28.0","v0.24.1","v0.24.0","v0.21.0","v0.20.0","v0.17.0","v0.16.0","v0.15.0","v0.10.2","v0.10.1","v0.8.0","v0.6.0","v0.5.2","v0.4.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77339.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:H/SA:N"}]}