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    "cveMetadata": {
        "cveId": "CVE-2026-15144",
        "assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "state": "PUBLISHED",
        "assignerShortName": "openjs",
        "dateReserved": "2026-07-08T17:27:38.479Z",
        "datePublished": "2026-07-29T16:10:24.560Z",
        "dateUpdated": "2026-07-29T17:56:31.392Z"
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                    "lang": "en",
                    "value": "@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.",
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                            "value": "@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."
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                    "product": "@fastify/rate-limit",
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                            "versionType": "semver",
                            "status": "affected",
                            "version": "0",
                            "lessThan": "11.2.0"
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                            "versionType": "semver",
                            "status": "unaffected",
                            "version": "11.2.0"
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                    "packageURL": "pkg:npm/@fastify/rate-limit"
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            "references": [
                {
                    "url": "https://github.com/fastify/fastify-rate-limit/security/advisories/GHSA-grpc-p53c-r64v"
                },
                {
                    "url": "https://cna.openjsf.org/security-advisories.html"
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                    "lang": "en",
                    "type": "reporter",
                    "value": "0xShemesh"
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                    "lang": "en",
                    "type": "remediation developer",
                    "value": "mcollina"
                },
                {
                    "lang": "en",
                    "type": "remediation reviewer",
                    "value": "climba03003"
                },
                {
                    "lang": "en",
                    "type": "remediation reviewer",
                    "value": "UlisesGascon"
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            ],
            "title": "@fastify/rate-limit vulnerable to rate-limit bypass via IPv6 address rotation",
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                        "baseScore": 7.3,
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                            "cweId": "CWE-307",
                            "lang": "en",
                            "description": "CWE-307: Improper Restriction of Excessive Authentication Attempts",
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                            "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
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