{"cve":"CVE-2026-111759","nvd":{"published":"2026-10-19T18:17:00.570","modified":"2026-10-19T21:13:39.973","status":"Awaiting Analysis","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. This issue is fixed in versions 14.3.2 and 15.0.2.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400","CWE-407"],"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"],"products":[],"source":"nvd","synced_at":"2026-10-21T03:56:58.798400159+00:00"},"epss":{"cve":"CVE-2026-111759","score":0.00591,"percentile":0.47952,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-r7fv-28h4-cvq7","url":"https://osv.dev/vulnerability/GHSA-r7fv-28h4-cvq7","summary":"markdown-it: Quadratic complexity in smartquotes with unmatched closing quotes","modified":"2026-10-20T14:45:03.780912898Z","packages":[{"ecosystem":"npm","name":"markdown-it","purl":"pkg:npm/markdown-it","ranges":[">=15.0.0 <15.0.2"],"fixed":["15.0.2"]},{"ecosystem":"npm","name":"markdown-it","purl":"pkg:npm/markdown-it","ranges":["<14.3.2"],"fixed":["14.3.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}