@fastify/rate-limit vulnerable to rate-limit bypass via IPv6 address rotation
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
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| @fastify/rate-limit | @fastify/rate-limit | unaffected |
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No data.
| Vendor | Product | Versions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fastify | Fastify/rate-limit |
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No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.395% probability within 30 days)
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| First Time appeared |
Fastify
Fastify fastify/rate-limit |
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| Vendors & Products |
Fastify
Fastify fastify/rate-limit |
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| Metrics |
ssvc
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| Description | @fastify/rate-limit before 11.2.0 keys rate-limit buckets by the verbatim client IP string returned from request.ip. Because a single IPv6 client can control a large address range (a /64 holds 2^64 distinct addresses) and the same address has multiple valid textual representations, an IPv6 capable client can defeat the rate-limit boundary by rotating addresses or by rewriting the same address in different forms. Applications that use @fastify/rate-limit to protect endpoints such as authentication, password reset, OTP delivery, or expensive API calls can be bypassed by IPv6 clients behind a proxy that surfaces IPv6 to the origin when trustProxy is enabled. The issue is fixed in @fastify/rate-limit 11.2.0, where the default key generator normalizes IPv6 addresses to their canonical form, collapses IPv4 mapped IPv6 to IPv4, and applies a configurable prefix mask (default /64) via a new ipv6Subnet option. | |
| Title | @fastify/rate-limit vulnerable to rate-limit bypass via IPv6 address rotation | |
| Weaknesses | CWE-307 CWE-770 |
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| References |
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| Metrics |
cvssV3_1
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