Allocation of Resources Without Limits or Throttling Affecting express-rate-limit package, versions >=8.0.0 <8.0.2>=8.1.0 <8.1.1>=8.2.0 <8.2.2
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published9 Mar 2026
- disclosed6 Mar 2026
- creditLetaoZhao
Introduced: 6 Mar 2026
NewCVE-2026-30827 (opens in a new tab)How to fix?
Upgrade express-rate-limit to version 8.0.2, 8.1.1, 8.2.2 or higher.
Overview
express-rate-limit is a Basic IP rate-limiting middleware for Express. Use to limit repeated requests to public APIs and/or endpoints such as password reset.
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the ipKeyGenerator function when handling IPv4-mapped IPv6 addresses on dual-stack servers. An attacker can cause all IPv4 clients to be rate-limited simultaneously by exhausting the shared rate limit bucket through repeated requests from a single IPv4 client.