{"id":"CVE-2026-107820","revision":null,"records":[{"revision":"2d581f8288b349daa2cd78579da671f2","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-107820","aliases":[],"title":"x64dbg-MCP Server vulnerable to pre-authentication denial of service through Content-Length integer overflow","description":"x64dbg-MCP Server is a native Model Context Protocol (MCP) plugin for x64dbg that exposes the debugger's full functionality over HTTP. Prior to 1.2, src/core/mcp_server.zig parses an unbounded Content-Length value in parseContentLength() and uses it in unchecked usize addition in wsRecv() before token authentication. The server listens on 0.0.0.0 by default in affected versions. An unauthenticated network client can supply a near-maximum Content-Length value to trigger a runtime integer-overflow panic in Debug and ReleaseSafe builds, terminating the entire x64dbg process and its live debugging session. The overflowed value is used only in a comparison, so the impact is limited to denial of service rather than memory corruption or code execution. This issue is fixed in version 1.2.","state":0,"publishedAt":"2026-10-09T17:42:45.1+00:00","modifiedAt":"2026-10-13T17:05:59.249+00:00","affected":[{"ecosystem":"Vendor product","name":"x64dbg-mcp-server","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"duty1g\",\n                    \"product\": \"x64dbg-mcp-server\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/duty1g/x64dbg-mcp-server/security/advisories/GHSA-jgj3-97w2-9v9r","https://github.com/duty1g/x64dbg-mcp-server/security/advisories/GHSA-4478-h5jv-647m","https://github.com/duty1g/x64dbg-mcp-server/commit/0dd4204d37c81d8b605133dc48c14886eeac1562","https://github.com/duty1g/x64dbg-mcp-server/releases/tag/v1.2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-107820","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-107820","identifiers":["CVE-2026-107820"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-2e6a476534094233b48f2f0b6da5cf35","complete":true,"records":13689,"lastAttemptAt":"2026-11-10T07:04:24.75366+00:00","lastSuccessAt":"2026-11-10T06:05:35.03+00:00","error":null,"lastVerifiedAt":"2026-11-10T06:05:35.03+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13742,"expectedIdentifiers":13742,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-10T07:03:58.7434242+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-10T07:03:58.7434242+00:00","lastSuccessAt":"2026-11-10T07:03:59.049149+00:00","error":null,"lastVerifiedAt":"2026-11-10T07:03:59.049149+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-d71a61bd41e147f4a9126c2a3d45b565","complete":false,"records":13695,"lastAttemptAt":"2026-11-10T07:04:24.141829+00:00","lastSuccessAt":"2026-11-10T07:04:24.138+00:00","error":"100 identifier lookups failed; latest failures include request timeout. 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