{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.120.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6ffa74f462cd2fa4f8dc1ee63c70b793b298c858"
            },
            {
              "fixed": "0f3a8e6868f592f044a2ecd9387ff3025825ad46"
            }
          ],
          "repo": "https://github.com/f1bonacc1/process-compose",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-5gm3-9crp-6g3v"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-306",
      "CWE-346"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77339.json"
  },
  "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.",
  "id": "CVE-2026-77339",
  "modified": "2026-09-20T11:31:03.729024170Z",
  "published": "2026-09-18T16:37:19.072Z",
  "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"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Process Compose: Browser DNS rebinding lets websites control local process-compose MCP tools"
}