CVE-2026-73089: Browserslist: Unbounded memory growth (no cache eviction) via distinct query results, leading to eventual OOM
Browserslist is a configuration tool for sharing target browsers and Node.js versions between front-end tools. Prior to 4.28.7, index.js retains every distinct (queries, context) result in cache and every parseQueries() AST in parseCache without a size cap, TTL, or eviction, allowing an attacker who can influence repeated browserslist() query values, including valid since <year>-<month>-<day> queries, to bypass the caller-controlled BROWSERSLISTDISABLECACHE mitigation and cause linear memory growth followed by an out-of-memory process crash. This issue is fixed in version 4.28.7.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
browserslistto a version that resolves this vulnerability.Fixed in 4.28.7
Event History
Frequently Asked Questions
What is the severity of CVE-2026-73089?
The severity of CVE-2026-73089 is high, with a CVSS score of 7.5.
How do I fix CVE-2026-73089?
To fix CVE-2026-73089, upgrade Browserslist to version 4.28.7 or later.
What type of vulnerability is CVE-2026-73089?
CVE-2026-73089 is a vulnerability that results in unbounded memory growth due to no cache eviction.
What impact does CVE-2026-73089 have on applications using Browserslist?
CVE-2026-73089 can lead to eventual out-of-memory (OOM) conditions in applications that exceed memory limits.
Which software is affected by CVE-2026-73089?
CVE-2026-73089 affects the npm package Browserslist versions prior to 4.28.7.