{"id":"CVE-2026-61568","state":"PUBLISHED","title":"@zereight/mcp-gitlab: DNS rebinding reaches local Streamable HTTP MCP transport","description":"`@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.","publishedAt":"2026-09-15T20:56:11.723Z","updatedAt":"2026-09-16T18:36:39.016Z","severity":{"score":9.6,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["zereight gitlab-mcp"],"affected":[{"vendor":"zereight","product":"gitlab-mcp","versions":[{"version":"< 2.1.30","status":"affected"}]}],"references":["https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-vmp7-252j-cwp7","https://github.com/zereight/gitlab-mcp/pull/555","https://github.com/zereight/gitlab-mcp/commit/52207c6f5c0e7a39e9235d491225edbb562a0290","https://github.com/zereight/gitlab-mcp/releases/tag/v2.1.30"],"weaknesses":["CWE-350"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/61xxx/CVE-2026-61568.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-61568","state":"PUBLISHED","datePublished":"2026-09-15T20:56:11.723Z","dateUpdated":"2026-09-16T18:36:39.016Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-10T16:48:39.924Z"},"containers":{"cna":{"title":"@zereight/mcp-gitlab: DNS rebinding reaches local Streamable HTTP MCP transport","descriptions":[{"lang":"en","value":"`@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."}],"affected":[{"vendor":"zereight","product":"gitlab-mcp","versions":[{"version":"< 2.1.30","status":"affected"}]}],"references":[{"url":"https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-vmp7-252j-cwp7","name":"https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-vmp7-252j-cwp7","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/zereight/gitlab-mcp/pull/555","name":"https://github.com/zereight/gitlab-mcp/pull/555","tags":["x_refsource_MISC"]},{"url":"https://github.com/zereight/gitlab-mcp/commit/52207c6f5c0e7a39e9235d491225edbb562a0290","name":"https://github.com/zereight/gitlab-mcp/commit/52207c6f5c0e7a39e9235d491225edbb562a0290","tags":["x_refsource_MISC"]},{"url":"https://github.com/zereight/gitlab-mcp/releases/tag/v2.1.30","name":"https://github.com/zereight/gitlab-mcp/releases/tag/v2.1.30","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.6,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-350","lang":"en","description":"CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-15T20:56:11.723Z"},"source":{"advisory":"GHSA-vmp7-252j-cwp7","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-16T18:21:15.912542Z","id":"CVE-2026-61568","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-16T18:36:39.016Z"}}]}}}