{"id":"CVE-2026-73088","aliases":["GHSA-73wf-gq98-2v4g"],"url":"https://o3.security/vulnerability/CVE-2026-73088","summary":"Browserslist: Uncaught crash / prototype write via untrusted browserslist-stats.json custom stats (normalizeStats)","details":"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.","published":"2026-08-11T17:00:05.869Z","modified":"2026-08-12T04:18:56.622369868Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/browserslist/browserslist/commit/f9914ad9effc865ccc27d816255625890b31ca51","label":"browserslist/browserslist@f9914ad"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73088.json"},{"type":"FIX","url":"https://github.com/browserslist/browserslist/commit/f9914ad9effc865ccc27d816255625890b31ca51"},{"type":"WEB","url":"https://github.com/browserslist/browserslist/releases/tag/4.28.7"},{"type":"ADVISORY","url":"https://github.com/browserslist/browserslist/security/advisories/GHSA-73wf-gq98-2v4g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73088"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T04:18:56.622369868Z"}}