CVE-2026-126204

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Source
https://cve.org/CVERecord?id=CVE-2026-126204
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126204.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-126204
Aliases
  • GHSA-j3cq-92fq-qg5f
Downstream
Published
2026-11-12T18:47:40Z
Modified
2026-11-14T10:31:01Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
express-rate-limit skipFailedRequests / skipSuccessfulRequests: with the default MemoryStore, a request from an earlier window is still un-counted from the current window
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-682"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126204.json"
}
References

Affected packages

Git / github.com/express-rate-limit/express-rate-limit

Affected ranges

Type
GIT
Repo
https://github.com/express-rate-limit/express-rate-limit
Events
Introduced
fffb3c4d6e614e79fcb5a6617c06cc57fd587ef0
Fixed
3fa4577b3acbe4cc2732e19f14d81ccb963445d6
Fixed
da5b115b97dd903076d37b19437fbd71445e150b
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "8.6.0"
                },
                {
                    "fixed": "8.7.2"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "da5b115b97dd903076d37b19437fbd71445e150b"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v8.7.2",
            "range": [
                {
                    "fixed": "3fa4577b3acbe4cc2732e19f14d81ccb963445d6"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

v8.*
v8.6.0
v8.6.1
v8.6.2
v8.7.0
v8.7.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126204.json"