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High
DEBIAN-CVE-2026-73088

Published Aug 11, 2026

CVSS

7.5

HIGH

EPSS

Exploit Prediction Scoring System — the modeled probability of in-the-wild exploitation in the next 30 days.

Affected packages

0
Summary

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.

Developer impact

Recommended action

Affected packages
Sources