{"id":"GHSA-w69h-vf37-j4w6","revision":null,"records":[{"revision":"e8dc0f63ac3b42b4a89095b96c82e770","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"MAL-2026-5484","aliases":["GHSA-hrmj-jj6j-m2m2","GHSA-w69h-vf37-j4w6"],"title":"Malicious code in mcp-server-sequential-thinking (npm)","description":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (211672c16839ae6cd4e9f10810163da536480f07938b2d51c50ecbbb9f5e90ed)\nUnscoped package impersonating the official @modelcontextprotocol/server-sequential-thinking MCP server. package.json declares postinstall: 'node index.js' and a bin entry mapping mcp-server-sequential-thinking to./index.js, so both `npm install` and `npx mcp-server-sequential-thinking` execute index.js automatically. index.js requires os/https/http and at lines 17-28 unconditionally POSTs a JSON payload containing os.hostname(), process.cwd(), the npm user-agent, Node version, and os.platform()/arch to https://npx-canary-log.vulnerable-live.workers.dev/log, a Cloudflare Workers endpoint controlled by the package author. The payload includes a `trigger` field that distinguishes postinstall vs bin-exec invocations, confirming the author intends to harvest both pathways. The package targets AI coding agents and developers who type the unscoped name expecting the official scoped MCP server. Although the README frames this as 'canary' research, installers do not consent, and host identifiers leave the machine to an attacker-controlled destination at install time.\n\n## Source: ghsa-malware (3ee441aba0778c86ceda85fd4fb9fd3f5df27e8bd5aa75d393d5c3377e9f5525)\nAny computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.\n","state":0,"publishedAt":"2026-06-09T20:34:37+00:00","modifiedAt":"2026-09-24T09:00:49.8673035+00:00","affected":[{"ecosystem":"npm","name":"mcp-server-sequential-thinking","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":["0.0.1","0.0.2"],"rawVersionEvidence":null}],"metrics":[],"references":["https://www.npmjs.com/package/mcp-server-sequential-thinking/v/0.0.1","https://www.npmjs.com/package/mcp-server-sequential-thinking/v/0.0.2","https://github.com/advisories/GHSA-hrmj-jj6j-m2m2","https://github.com/advisories/GHSA-w69h-vf37-j4w6"],"sourceUrl":"https://osv.dev/vulnerability/MAL-2026-5484","license":"OSV · upstream source license applies","key":"osv:MAL-2026-5484","identifiers":["MAL-2026-5484","GHSA-hrmj-jj6j-m2m2","GHSA-w69h-vf37-j4w6"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-12T17:18:53.3551573+00:00","complete":true,"records":1779,"lastAttemptAt":"2026-11-12T17:18:53.3551573+00:00","lastSuccessAt":"2026-11-12T17:18:53.5098368+00:00","error":null,"lastVerifiedAt":"2026-11-12T17:18:53.5098375+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-64752486c567b55b31fb0d7225f5222bcd0019564ac0ac5f0649e242c7b19299-c64cc013e4ac327a566ebd7919181330aa5f66a956ac80541b59e61c9511ffa7","complete":true,"records":424746,"lastAttemptAt":"2026-11-12T17:16:18.2884716+00:00","lastSuccessAt":"2026-11-12T16:16:35.9151725+00:00","error":"AccessDenied (HTTP 403)","lastVerifiedAt":"2026-11-12T16:16:35.996916+00:00","snapshotPublishedAt":"2026-11-12T15:27:51+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. 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-88e6245ba7dc4729a2344f78a2d37df7","complete":true,"records":13774,"lastAttemptAt":"2026-11-12T17:19:38.3951622+00:00","lastSuccessAt":"2026-11-12T17:19:38.384+00:00","error":null,"lastVerifiedAt":"2026-11-12T17:19:38.384+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13827,"expectedIdentifiers":13827,"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":"2026-11-12T17:18:53.3551573+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-12T17:18:53.3551573+00:00","lastSuccessAt":"2026-11-12T17:18:53.5137452+00:00","error":null,"lastVerifiedAt":"2026-11-12T17:18:53.5137465+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-053c822da76a4019981dc05530c81af1","complete":false,"records":13774,"lastAttemptAt":"2026-11-12T17:19:19.2511928+00:00","lastSuccessAt":"2026-11-12T17:19:19.245+00:00","error":"200 identifier lookups failed; latest failures include HttpError (HTTP 503). Other identifiers were checked independently.","lastVerifiedAt":"2026-11-12T17:19:19.245+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13613,"expectedIdentifiers":13827,"failedIdentifiers":200},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-3562b6c78fd1bd0f0b55daf66a0926ae24f65e462df7f6d928caad458fc696bf","complete":true,"records":9947,"lastAttemptAt":"2026-11-12T17:18:53.1888873+00:00","lastSuccessAt":"2026-11-11T04:27:43.6877707+00:00","error":null,"lastVerifiedAt":"2026-11-12T17:18:53.1888873+00:00","snapshotPublishedAt":"2026-11-11T03:32:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-456002455e0ab94bb92c95476d4e6d175c104cd594749982afd96c893728ecbc","complete":true,"records":2010,"lastAttemptAt":"2026-11-12T17:16:18.5164346+00:00","lastSuccessAt":"2026-11-11T02:36:58.1276999+00:00","error":null,"lastVerifiedAt":"2026-11-12T17:16:18.5164346+00:00","snapshotPublishedAt":"2026-11-11T01:17:51+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-0d57668ba92a2918d0664e89ea91d467f8e6a2bc6330923eb883b74ac42a14ec","complete":true,"records":3125,"lastAttemptAt":"2026-11-12T17:18:53.2989437+00:00","lastSuccessAt":"2026-11-12T15:18:36.6112732+00:00","error":null,"lastVerifiedAt":"2026-11-12T17:18:53.2989437+00:00","snapshotPublishedAt":"2026-11-12T14:48:37+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-bde599d85a9f7715a977e2ca25ddb66721130a1c4ff1699631218bc0243e1ab5","complete":true,"records":231717,"lastAttemptAt":"2026-11-12T17:18:53.040847+00:00","lastSuccessAt":"2026-11-12T17:18:51.4424333+00:00","error":null,"lastVerifiedAt":"2026-11-12T17:18:53.040847+00:00","snapshotPublishedAt":"2026-11-12T16:33:03+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}