{"id":"CVE-2025-59830","state":"PUBLISHED","title":"Rack QueryParser has an unsafe default allowing params_limit bypass via semicolon-separated parameters","description":"Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its params_limit only for parameters separated by &, while still splitting on both & and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters than intended. Applications or middleware that directly invoke Rack::QueryParser with its default configuration (no explicit delimiter) could be exposed to increased CPU and memory consumption. This can be abused as a limited denial-of-service vector. This issue has been patched in version 2.2.18.","publishedAt":"2025-09-25T14:37:06.967Z","updatedAt":"2025-09-25T16:16:15.255Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["rack rack"],"affected":[{"vendor":"rack","product":"rack","versions":[{"version":"< 2.2.18","status":"affected"}]}],"references":["https://github.com/rack/rack/security/advisories/GHSA-625h-95r8-8xpm","https://github.com/rack/rack/commit/54e4ffdd5affebcb0c015cc6ae74635c0831ed71"],"weaknesses":["CWE-400","CWE-770"],"ingestedAt":"2026-10-29T20:09:39.787Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/59xxx/CVE-2025-59830.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2025-59830","state":"PUBLISHED","datePublished":"2025-09-25T14:37:06.967Z","dateUpdated":"2025-09-25T16:16:15.255Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2025-09-22T14:34:03.471Z"},"containers":{"cna":{"title":"Rack QueryParser has an unsafe default allowing params_limit bypass via semicolon-separated parameters","descriptions":[{"lang":"en","value":"Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its params_limit only for parameters separated by &, while still splitting on both & and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters than intended. Applications or middleware that directly invoke Rack::QueryParser with its default configuration (no explicit delimiter) could be exposed to increased CPU and memory consumption. This can be abused as a limited denial-of-service vector. This issue has been patched in version 2.2.18."}],"affected":[{"vendor":"rack","product":"rack","versions":[{"version":"< 2.2.18","status":"affected"}]}],"references":[{"url":"https://github.com/rack/rack/security/advisories/GHSA-625h-95r8-8xpm","name":"https://github.com/rack/rack/security/advisories/GHSA-625h-95r8-8xpm","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/rack/rack/commit/54e4ffdd5affebcb0c015cc6ae74635c0831ed71","name":"https://github.com/rack/rack/commit/54e4ffdd5affebcb0c015cc6ae74635c0831ed71","tags":["x_refsource_MISC"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"CWE-770: Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2025-09-25T14:37:06.967Z"},"source":{"advisory":"GHSA-625h-95r8-8xpm","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-09-25T16:14:17.653996Z","id":"CVE-2025-59830","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-09-25T16:16:15.255Z"}}]}}}