{"id":"EUVD-2026-104538","revision":null,"records":[{"revision":"5358123ba5704bcaaee681d998208727","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-111759","aliases":[],"title":"markdown-it: Quadratic complexity in smartquotes with unmatched closing quotes","description":"markdown-it is a Markdown parser. Prior to 14.3.2 and 15.0.2, when typographer: true is enabled, specially crafted Markdown can cause quadratic processing time in the smartquotes rule, potentially leading to denial of service in applications processing untrusted input. Many opening double quotes followed by unmatched closing single quotes cause repeated scans of the entire opener stack. The same issue occurs with the quote types reversed. The default configuration (typographer: false) is not affected, but this option is enabled with high probability. 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This issue is fixed in versions 14.3.2 and 15.0.2.","state":0,"publishedAt":"2026-10-19T18:17:00.57+00:00","modifiedAt":"2026-10-19T21:13:39.973+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/markdown-it/markdown-it/commit/1b379c1b6d0522421bd1a51b77337c79af2c8670","https://github.com/markdown-it/markdown-it/commit/cf27366035edf9196667110c47d9d67b030a4152","https://github.com/markdown-it/markdown-it/commit/daf5a3c32303e5d9de01b12eeb725fb5990b8162","https://github.com/markdown-it/markdown-it/releases/tag/14.3.2","https://github.com/markdown-it/markdown-it/releases/tag/15.0.2","https://github.com/markdown-it/markdown-it/security/advisories/GHSA-r7fv-28h4-cvq7"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-111759","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-400","CWE-407"],"productCriteria":[],"sourceDates":{"published":"2026-10-19T18:17:00.570","lastModified":"2026-10-19T21:13:39.973"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-111759","identifiers":["CVE-2026-111759"]},"retained":false,"historicalAffected":[]},{"revision":"27c47ffcc26740eea93001a1aea07217","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-r7fv-28h4-cvq7","aliases":["CVE-2026-111759"],"title":"markdown-it: Quadratic complexity in smartquotes with unmatched closing quotes","description":"### Impact\n\nWhen `typographer: true` is enabled, specially crafted Markdown can cause quadratic processing time in the smartquotes rule, potentially leading to denial of service in applications processing untrusted input.\n\nMany opening double quotes followed by unmatched closing single quotes cause repeated scans of the entire opener stack. The same issue occurs with the quote types reversed.\n\nThe default configuration (`typographer: false`) is not affected, but this option is enabled with high probability.\n\n### Reproduction\n\n```js\nimport MarkdownIt from 'markdown-it'\nimport { performance } from 'node:perf_hooks'\n\nconst md = new MarkdownIt({ typographer: true })\n\nfor (const k of [2000, 4000, 8000, 16000, 32000]) {\n  const input = '\"a '.repeat(k) + \"b' \".repeat(k)\n  const start = performance.now()\n  md.render(input)\n  console.log(input.length, (performance.now() - start).toFixed(1), 'ms')\n}\n```\n\nResult:\n\n|input size|time|\n|-|-|\n|12000|18ms|\n|24000|47ms|\n|48000|115ms|\n|96000|428ms|\n|192000|1586ms|\n\n### Patches\n\nFixed in **15.0.2** and **14.3.2**.\n\n### Workarounds\n\nDisable typography with `typographer: false`, or disable only the smartquotes rule:\n\n```js\nmd.disable('smartquotes')\n```","state":0,"publishedAt":"2026-10-20T14:34:50+00:00","modifiedAt":"2026-10-20T14:45:03.7809129+00:00","affected":[{"ecosystem":"npm","name":"markdown-it","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"15.0.0"},{"kind":"fixed","version":"15.0.2"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"markdown-it","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"14.3.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/markdown-it/markdown-it/security/advisories/GHSA-r7fv-28h4-cvq7","https://nvd.nist.gov/vuln/detail/CVE-2026-111759","https://github.com/markdown-it/markdown-it/commit/1b379c1b6d0522421bd1a51b77337c79af2c8670","https://github.com/markdown-it/markdown-it/commit/cf27366035edf9196667110c47d9d67b030a4152","https://github.com/markdown-it/markdown-it/commit/daf5a3c32303e5d9de01b12eeb725fb5990b8162","https://github.com/markdown-it/markdown-it","https://github.com/markdown-it/markdown-it/releases/tag/14.3.2","https://github.com/markdown-it/markdown-it/releases/tag/15.0.2"],"sourceUrl":"https://github.com/advisories/GHSA-r7fv-28h4-cvq7","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-r7fv-28h4-cvq7","identifiers":["GHSA-r7fv-28h4-cvq7","CVE-2026-111759"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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