# express-rate-limit (npm) vulnerabilities

1 known vulnerability (1 high), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: 8.7.3 (Nov 2, 2026): no advisory affects it
- Newest unaffected release: 8.7.3 (Nov 2, 2026), the latest release
- Weekly downloads: 93.5M
- Dependents: 94.4K
- Releases: 133 since 1.0.0 (Dec 11, 2014)
- Registry: https://www.npmjs.com/package/express-rate-limit
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2026-30827: 8.0.0 to 8.0.1 (8.0.2 is outside it); 8.1.0 (8.1.1 is outside it); 8.2.0 to 8.2.1 (8.2.2 is outside it)

## Advisories (1)

### [CVE-2026-30827](https://cve.now/CVE-2026-30827): express-rate-limit: IPv4-mapped IPv6 addresses bypass per-client rate limiting (all IPv4 clients share one bucket on dual-stack servers)

- Severity: High 7.5
- Published: Mar 7, 2026
- Affected: from 8.2.0, fixed in 8.2.2; from 8.1.0, fixed in 8.1.1; from 8.0.0, fixed in 8.0.2.
- Fixed in 8.0.2 (released Mar 5, 2026, 2 days before disclosure), 8.1.1 (released Mar 5, 2026, 2 days before disclosure) and 8.2.2 (released Mar 5, 2026, 2 days before disclosure).
- The latest release, 8.7.3, is not affected.
- 2.6% of express-rate-limit downloads last week were affected versions (2.6M).

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