{"id":"CVE-2026-61568","summary":"@zereight/mcp-gitlab: DNS rebinding reaches local Streamable HTTP MCP transport","details":"`@zereight/mcp-gitlab` is a Model Context Protocol server for GitLab. Versions prior to 2.1.30 expose the Streamable HTTP MCP endpoint without an effective Host or Origin allowlist. A malicious web page can use DNS rebinding to route browser requests to a victim's local MCP listener while preserving an attacker-controlled `Host` and `Origin`. The server accepts those headers and reaches the MCP initialization path instead of rejecting the request at the HTTP boundary. Version 2.1.30 contains a patch.","aliases":["GHSA-vmp7-252j-cwp7"],"modified":"2026-09-18T03:30:48.943269116Z","published":"2026-09-15T20:56:11.723Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61568.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-350"]},"references":[{"type":"WEB","url":"https://github.com/zereight/gitlab-mcp/releases/tag/v2.1.30"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61568.json"},{"type":"ADVISORY","url":"https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-vmp7-252j-cwp7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61568"},{"type":"FIX","url":"https://github.com/zereight/gitlab-mcp/commit/52207c6f5c0e7a39e9235d491225edbb562a0290"},{"type":"FIX","url":"https://github.com/zereight/gitlab-mcp/pull/555"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/zereight/gitlab-mcp","events":[{"introduced":"0"},{"fixed":"52207c6f5c0e7a39e9235d491225edbb562a0290"},{"fixed":"cff3ebeec272d7cc609d9b3cab57f52cb15fae96"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.1.30"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v2.1.29","v2.1.28","v2.1.27","v2.1.26","v2.1.25","v2.1.24","v2.1.23","v2.1.22","v2.1.21","v2.1.20","v2.1.19","v2.1.18","v2.1.17","v2.1.16","v2.1.15","v2.1.14","v2.1.13","v2.1.12","v2.1.11","v2.1.10","v2.1.9","v2.1.8","v2.1.7","v2.1.6","v2.1.5","v2.1.4","v2.1.3","v2.1.2","v2.1.1","v2.1.0","v2.0.36","v2.0.35","v2.0.34","v2.0.33","v2.0.32","v2.0.30","v2.0.28","v2.0.25","v2.0.24","v2.0.23","v2.0.22","v2.0.21","v2.0.20","v2.0.19","v2.0.18","v2.0.17","v2.0.16","v2.0.15","v2.0.14","v2.0.13","v2.0.12","v2.0.11","v2.0.9","v2.0.10","v2.0.7","v2.0.6","v2.0.5","v2.0.4","v2.0.3","v1.0.76","v1.0.73","v1.0.72","v","v1.0.65","v1.0.64","1.0.63","v1.0.63","1.0.62","1.0.60","v1.0.59","v1.0.57","v1.0.56","v1.0.54","v1.0.53","v1.0.52","v1.0.50","v1.0.48","v1.0.47","v1.0.46","v1.0.45","v1.0.42","v1.0.40","v1.0.39","v1.0.38","v1.0.37","v1.0.36","v1.0.34","1.0.32"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61568.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H"}]}