Allocation of Resources Without Limits or Throttling in browserslist - CVE-2026-73089

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to 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 `--` queries, to bypass the caller-controlled BROWSERSLIST_DISABLE_CACHE mitigation and cause linear memory growth followed by an out-of-memory process crash. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Affected software

How to mitigate CVE-2026-73089

External 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

Related Security Bulletins

• Allocation of resources without limits or throttling in Browserslist
• Multiple vulnerabilities in Platform Navigator in IBM Cloud Pak for Integration (CP4I)