{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-125111", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-11-09T17:45:35.936Z", "datePublished": "2026-11-09T22:02:38.334Z", "dateUpdated": "2026-11-09T22:02:38.334Z"}, "containers": {"cna": {"title": "Rack: Multipart parsing allows DoS via unbounded scan buffer growth", "problemTypes": [{"descriptions": [{"cweId": "CWE-400", "lang": "en", "description": "CWE-400: Uncontrolled Resource Consumption", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"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"}}], "references": [{"name": "https://github.com/rack/rack/security/advisories/GHSA-5v64-555j-wjxm", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/rack/rack/security/advisories/GHSA-5v64-555j-wjxm"}, {"name": "https://github.com/rack/rack/commit/244e75a840cee0823f86d5d01dc374505a8abed8", "tags": ["x_refsource_MISC"], "url": "https://github.com/rack/rack/commit/244e75a840cee0823f86d5d01dc374505a8abed8"}, {"name": "https://github.com/rack/rack/commit/2eaa5b1026a03a43b6537b1a0b233707ba887702", "tags": ["x_refsource_MISC"], "url": "https://github.com/rack/rack/commit/2eaa5b1026a03a43b6537b1a0b233707ba887702"}, {"name": "https://github.com/rack/rack/commit/c9b4698595050838342bd3b5a0fc9ab908065f8f", "tags": ["x_refsource_MISC"], "url": "https://github.com/rack/rack/commit/c9b4698595050838342bd3b5a0fc9ab908065f8f"}], "affected": [{"vendor": "rack", "product": "rack", "versions": [{"version": "< 2.2.25", "status": "affected"}, {"version": ">= 3.0, < 3.1.23", "status": "affected"}, {"version": ">= 3.2, < 3.2.8", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-09T22:02:38.334Z"}, "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."}], "source": {"advisory": "GHSA-5v64-555j-wjxm", "discovery": "UNKNOWN"}}}}

{}

{"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": "2026-11-09T22:18:42.433", "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"}]}, "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": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"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"]}