{"cve":"CVE-2026-73088","nvd":{"published":"2026-08-11T17:19:16.977","modified":"2026-09-09T20:44:04.357","status":"Awaiting Analysis","description":"Browserslist is a configuration tool for sharing target browsers and Node.js versions between front-end tools. Prior to 4.28.7, normalizeStats() in node.js, reached unconditionally through getStat() and loadStat() on every browserslist() call, processes untrusted browserslist-stats.json, opts.stats, and CLI --stats data with an unguarded for...in loop and plain-object bracket access and assignment, allowing inherited Object.prototype keys including __proto__, toString, valueOf, constructor, hasOwnProperty, and isPrototypeOf to cause an uncaught TypeError or modify the prototype of the returned normalized object. This issue is fixed in version 4.28.7.","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-248","CWE-1321"],"references":["https://github.com/browserslist/browserslist/commit/f9914ad9effc865ccc27d816255625890b31ca51","https://github.com/browserslist/browserslist/releases/tag/4.28.7","https://github.com/browserslist/browserslist/security/advisories/GHSA-73wf-gq98-2v4g","https://github.com/browserslist/browserslist/security/advisories/GHSA-73wf-gq98-2v4g"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:47:54.990491175+00:00"},"epss":{"cve":"CVE-2026-73088","score":0.00658,"percentile":0.51501,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-73wf-gq98-2v4g","url":"https://osv.dev/vulnerability/GHSA-73wf-gq98-2v4g","summary":"Browserslist: Uncaught crash / prototype write via untrusted browserslist-stats.json custom stats (normalizeStats)","modified":"2026-09-10T03:51:15.295037659Z","packages":[{"ecosystem":"npm","name":"browserslist","purl":"pkg:npm/browserslist","ranges":["<4.28.7"],"fixed":["4.28.7"]}]}],"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."]}