CVE-2026-125111

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{}

{"affected": [{"affectedData": [{"product": "rack", "vendor": "rack", "versions": [{"status": "affected", "version": "< 2.2.25"}, {"status": "affected", "version": ">= 3.0, < 3.1.23"}, {"status": "affected", "version": ">= 3.2, < 3.2.8"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Rack is a modular Ruby web server interface. Prior to 2.2.25, 3.1.23, and 3.2.8, Rack::Multipart::Parser can retain parsed data in its internal StringScanner buffer when reads end inside or immediately after multipart headers. An unauthenticated attacker can align many small parts with rack.multipart.buffer_size boundaries so the buffer grows with the request despite per-field, header, and preamble limits, causing a worker to exhaust memory. The attack requires only a well-formed multipart body and affects applications that parse multipart requests. This issue is fixed in versions 2.2.25, 3.1.23, and 3.2.8."}], "id": "CVE-2026-125111", "lastModified": "2026-11-12T19:18:09.510", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-125111", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-12T16:37:33.895886Z", "version": "2.0.3"}}]}, "published": "2026-11-09T22:18:42.433", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/rack/rack/commit/244e75a840cee0823f86d5d01dc374505a8abed8"}, {"source": "security-advisories@github.com", "url": "https://github.com/rack/rack/commit/2eaa5b1026a03a43b6537b1a0b233707ba887702"}, {"source": "security-advisories@github.com", "url": "https://github.com/rack/rack/commit/c9b4698595050838342bd3b5a0fc9ab908065f8f"}, {"source": "security-advisories@github.com", "url": "https://github.com/rack/rack/security/advisories/GHSA-5v64-555j-wjxm"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,2.2.25)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[3.0,3.1.23)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[3.2,3.2.8)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "rack", "source": "cna", "vendor": "rack"}, "product": "rack", "vendor": "rack"}], "created": "2026-11-09T23:30:18.548649+00:00", "updated": "2026-11-10T00:00:11.049557+00:00", "vendors": ["rack", "rack$PRODUCT$rack"]}