CVE Explorer
CVE-2026-30827
express-rate-limit is a basic rate-limiting middleware for Express. In versions starting from 8.0.0 and prior to versions 8.0.2, 8.1.1, 8.2.2, and 8.3.0, the default keyGenerator in express-rate-limit applies IPv6 subnet masking (/56 by default) to all addresses that net.isIPv6() returns true for. This includes IPv4-mapped IPv6 addresses (::ffff:x.x.x.x), which Node.js returns as request.ip on dual-stack servers. Because the first 80 bits of all IPv4-mapped addresses are zero, a /56 (or any /32
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"express-rate-limit","vendor":"express-rate-limit","versions":[{"status":"affected","version":">= 8.0.0, < 8.0.2"},{"status":"affected","version":">= 8.1.0, < 8.1.1"},{"status":"affected","version":">= 8.2.0, < 8.2.2"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:89532cf325e76e406f2c37aeedc14aadd32bde48fc31993dd6438327c80744de · sha256:5bc10419e8c9f429… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:89532cf325e76e406f2c37aeedc14aadd32bde48fc31993dd6438327c80744de · sha256:5bc10419e8c9f429… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:89532cf325e76e406f2c37aeedc14aadd32bde48fc31993dd6438327c80744de · sha256:5bc10419e8c9f429… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"name":"https://github.com/express-rate-limit/express-rate-limit/commit/14e53888cdfd1b9798faf5b634c4206409e27fc4","tags":["x_refsource_MISC"],"url":"https://github.com/express-rate-limit/express-rate-limit/commit/14e53888cdfd1b9798faf5b634c4206409e27fc4"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:89532cf325e76e406f2c37aeedc14aadd32bde48fc31993dd6438327c80744de · sha256:5bc10419e8c9f429… · /containers/cna/references/1
{"name":"https://github.com/express-rate-limit/express-rate-limit/security/advisories/GHSA-46wh-pxpv-q5gq","tags":["x_refsource_CONFIRM"],"url":"https://github.com/express-rate-limit/express-rate-limit/security/advisories/GHSA-46wh-pxpv-q5gq"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:89532cf325e76e406f2c37aeedc14aadd32bde48fc31993dd6438327c80744de · sha256:5bc10419e8c9f429… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.