{"cve":"CVE-2023-39663","nvd":{"published":"2023-08-29T20:15:09.990","modified":"2026-06-17T06:12:41.510","status":"Modified","description":"Mathjax up to v2.7.9 was discovered to contain two Regular expression Denial of Service (ReDoS) vulnerabilities in MathJax.js via the components pattern and markdownPattern. NOTE: the vendor disputes this because the regular expressions are not applied to user input; thus, there is no risk.","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-1333"],"references":["https://github.com/mathjax/MathJax/issues/3074","https://github.com/mathjax/MathJax/issues/3074"],"products":["mathjax:mathjax"],"source":"nvd","synced_at":"2026-10-19T21:39:14.809778102+00:00"},"epss":{"cve":"CVE-2023-39663","score":0.00819,"percentile":0.5725,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-v638-q856-grg8","url":"https://osv.dev/vulnerability/GHSA-v638-q856-grg8","summary":"MathJax Regular expression Denial of Service (ReDoS)","modified":"2026-09-10T03:49:57.725467096Z","packages":[{"ecosystem":"npm","name":"mathjax","purl":"pkg:npm/mathjax","ranges":["<=2.7.9"],"fixed":[]}]}],"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."]}