What’s Vulnerable › Vulnerabilities

CVE-2026-73089: Browserslist: Unbounded memory growth (no cache eviction) via distinct query results, leading to eventual OOM

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-11 · updated 2026-09-09
• Weakness: CWE-770

Description

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 BROWSERSLIST_DISABLE_CACHE mitigation and cause linear memory growth followed by an out-of-memory process crash. This issue is fixed in version 4.28.7.

Affected products

• Npm Browserslist: before 4.28.7 — fixed in 4.28.7
• browserslist: before 4.28.7

How to fix

Upgrade to a fixed version: Npm Browserslist 4.28.7. Check the vendor advisory for mitigations.

References

• https://github.com/browserslist/browserslist/commit/f2931a3ff2a3a31abf84ef01a7400b270aad6405
• https://github.com/browserslist/browserslist/releases/tag/4.28.7
• https://github.com/browserslist/browserslist/security/advisories/GHSA-c83g-rgw3-j3cx

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