{"id":"CVE-2026-54566","revision":null,"records":[{"revision":"76de55024fc5412a8563c6e3740c1d85","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-54566","aliases":[],"title":"Markdown Preview Enhanced: Remote Code Execution via VM Sandbox Escape in `.crossnote/config.js` and `.crossnote/parser.js`","description":"Markdown Preview Enhanced is a Markdown preview extension for Visual Studio Code. Prior to 0.8.29, Markdown Preview Enhanced evaluates repository-controlled .crossnote/config.js and .crossnote/parser.js files with vm.runInNewContext, which does not provide a security boundary from the Node.js host realm. Opening a Markdown file in a malicious repository automatically loads these files, and prototype-chain traversal can reach the host Function constructor and process object, allowing operating-system commands to execute as the victim account without further interaction. Both configuration evaluation and parser-hook evaluation are affected, and the attack does not depend on module-scoped require being available. This issue is fixed in version 0.8.29.","state":0,"publishedAt":"2026-10-14T19:08:43.663+00:00","modifiedAt":"2026-10-14T19:45:22.736+00:00","affected":[{"ecosystem":"Vendor product","name":"vscode-markdown-preview-enhanced","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"shd101wyy\",\n                    \"product\": \"vscode-markdown-preview-enhanced\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.8.29\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.5,"severity":"HIGH"}],"references":["https://github.com/shd101wyy/vscode-markdown-preview-enhanced/security/advisories/GHSA-427h-jhpr-8jch","https://github.com/shd101wyy/crossnote/pull/443","https://github.com/shd101wyy/vscode-markdown-preview-enhanced/pull/2320","https://github.com/shd101wyy/crossnote/commit/e4890d64502e53b717cce0cb73f1a78b244dc640","https://github.com/shd101wyy/vscode-markdown-preview-enhanced/commit/0d4010988c6ae56a38c6dec4a7509cbd5a7dcb4c","https://github.com/shd101wyy/crossnote/releases/tag/0.9.30","https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.29"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-54566","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-54566","identifiers":["CVE-2026-54566"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EPSS backfill.","generation":"2026-11-10T00:04:20.9434546+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-10T00:04:20.9434546+00:00","lastSuccessAt":"2026-11-10T00:04:21.6231234+00:00","error":null,"lastVerifiedAt":"2026-11-10T00:04:21.6231235+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. 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