{"cve":"CVE-2026-93749","nvd":{"published":"2026-09-18T18:18:33.480","modified":"2026-09-22T20:25:55.870","status":"Awaiting Analysis","description":"source-map-js through 1.2.1 fails to validate the per-section offset line value in indexed source maps, allowing attackers to specify arbitrary numeric values. Attackers can supply extremely large offset line values that cause synchronous event loop blocking for extended periods, preventing the service from handling other requests.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7},"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-1284"],"references":["https://github.com/7rulnik/source-map-js","https://github.com/7rulnik/source-map-js/blob/c1cd8904bb7bd0c7fb5879fcda48134d82a27934/lib/source-node.js#L115-L118","https://github.com/7rulnik/source-map-js/issues/76","https://www.vulncheck.com/advisories/source-map-js-through-1.2.1-event-loop-denial-of-service"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:55:23.253742848+00:00"},"epss":{"cve":"CVE-2026-93749","score":0.00455,"percentile":0.3952,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-68fv-2mgg-jv7q","url":"https://osv.dev/vulnerability/GHSA-68fv-2mgg-jv7q","summary":"source-map-js allows event-loop denial of service through indexed source-map section offsets","modified":"2026-10-05T23:45:07.974936711Z","packages":[{"ecosystem":"npm","name":"source-map-js","purl":"pkg:npm/source-map-js","ranges":[">=1.0.0 <1.2.2"],"fixed":["1.2.2"]}]}],"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."]}