CVE-2026-126204

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-126204", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-11-10T20:07:44.958Z", "datePublished": "2026-11-12T18:47:40.963Z", "dateUpdated": "2026-11-12T18:47:40.963Z"}, "containers": {"cna": {"title": "express-rate-limit skipFailedRequests / skipSuccessfulRequests: with the default MemoryStore, a request from an earlier window is still un-counted from the current window", "problemTypes": [{"descriptions": [{"cweId": "CWE-682", "lang": "en", "description": "CWE-682: Incorrect Calculation", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}}], "references": [{"name": "https://github.com/express-rate-limit/express-rate-limit/security/advisories/GHSA-j3cq-92fq-qg5f", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/express-rate-limit/express-rate-limit/security/advisories/GHSA-j3cq-92fq-qg5f"}, {"name": "https://github.com/express-rate-limit/express-rate-limit/pull/707", "tags": ["x_refsource_MISC"], "url": "https://github.com/express-rate-limit/express-rate-limit/pull/707"}, {"name": "https://github.com/express-rate-limit/express-rate-limit/commit/da5b115b97dd903076d37b19437fbd71445e150b", "tags": ["x_refsource_MISC"], "url": "https://github.com/express-rate-limit/express-rate-limit/commit/da5b115b97dd903076d37b19437fbd71445e150b"}, {"name": "https://github.com/express-rate-limit/express-rate-limit/releases/tag/v8.7.2", "tags": ["x_refsource_MISC"], "url": "https://github.com/express-rate-limit/express-rate-limit/releases/tag/v8.7.2"}], "affected": [{"vendor": "express-rate-limit", "product": "express-rate-limit", "versions": [{"version": ">= 8.6.0, < 8.7.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-12T18:47:40.963Z"}, "descriptions": [{"lang": "en", "value": "express-rate-limit is a basic rate-limiting middleware for Express. From 8.6.0 until 8.7.2, the built-in MemoryStore returns a Client whose mutable resetTime object is retained by middleware using skipFailedRequests or skipSuccessfulRequests. When a later request resets the client window, MemoryStore.resetClient mutates that same Date, so an earlier request that finishes or disconnects after the reset can pass the stale-window guard and decrement the current window's count. A client able to keep requests in flight across the boundary can obtain a bounded extra burst of up to one additional configured limit in the new window; the behavior does not increase the sustained rate. Stores that return a fresh Date are not affected. This issue is fixed in version 8.7.2."}], "source": {"advisory": "GHSA-j3cq-92fq-qg5f", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "express-rate-limit", "vendor": "express-rate-limit", "versions": [{"status": "affected", "version": ">= 8.6.0, < 8.7.2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "express-rate-limit is a basic rate-limiting middleware for Express. From 8.6.0 until 8.7.2, the built-in MemoryStore returns a Client whose mutable resetTime object is retained by middleware using skipFailedRequests or skipSuccessfulRequests. When a later request resets the client window, MemoryStore.resetClient mutates that same Date, so an earlier request that finishes or disconnects after the reset can pass the stale-window guard and decrement the current window's count. A client able to keep requests in flight across the boundary can obtain a bounded extra burst of up to one additional configured limit in the new window; the behavior does not increase the sustained rate. Stores that return a fresh Date are not affected. This issue is fixed in version 8.7.2."}], "id": "CVE-2026-126204", "lastModified": "2026-11-12T22:09:39.233", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-11-12T19:16:56.713", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/express-rate-limit/express-rate-limit/commit/da5b115b97dd903076d37b19437fbd71445e150b"}, {"source": "security-advisories@github.com", "url": "https://github.com/express-rate-limit/express-rate-limit/pull/707"}, {"source": "security-advisories@github.com", "url": "https://github.com/express-rate-limit/express-rate-limit/releases/tag/v8.7.2"}, {"source": "security-advisories@github.com", "url": "https://github.com/express-rate-limit/express-rate-limit/security/advisories/GHSA-j3cq-92fq-qg5f"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-682"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.6.0,8.7.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "express-rate-limit", "source": "cna", "vendor": "express-rate-limit"}, "product": "express-rate-limit", "vendor": "express-rate-limit"}], "created": "2026-11-13T01:00:09.807863+00:00", "updated": "2026-11-13T01:00:09.807877+00:00", "vendors": ["express-rate-limit", "express-rate-limit$PRODUCT$express-rate-limit"]}