{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62864","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-07-14T21:10:50.032Z","datePublished":"2026-10-30T20:34:42.963Z","dateUpdated":"2026-10-30T20:34:42.963Z"},"containers":{"cna":{"title":"Ring's nested-params middleware has inefficient regular expression complexity","problemTypes":[{"descriptions":[{"cweId":"CWE-1333","lang":"en","description":"CWE-1333: Inefficient Regular Expression Complexity","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/ring-clojure/ring/security/advisories/GHSA-q2j3-fc6x-78jj","tags":["x_refsource_CONFIRM"],"url":"https://github.com/ring-clojure/ring/security/advisories/GHSA-q2j3-fc6x-78jj"},{"name":"https://github.com/ring-clojure/ring/commit/18738cbb8ab7504da4a5c72c9eb5fdcbf142646e","tags":["x_refsource_MISC"],"url":"https://github.com/ring-clojure/ring/commit/18738cbb8ab7504da4a5c72c9eb5fdcbf142646e"},{"name":"https://github.com/ring-clojure/ring/tree/1.15.5","tags":["x_refsource_MISC"],"url":"https://github.com/ring-clojure/ring/tree/1.15.5"}],"affected":[{"vendor":"ring-clojure","product":"ring","versions":[{"version":"< 1.15.5","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-10-30T20:34:42.963Z"},"descriptions":[{"lang":"en","value":"Ring is a Clojure web applications library inspired by Python's WSGI and Ruby's Rack. Prior to 1.15.5, `wrap-nested-params` in the `ring.middleware.nested-params` namespace uses a backtracking regular expression to match parameter names from URL query strings and HTTP request bodies. An attacker can craft a parameter name that drives quadratic O(n^2) matching work, causing regular-expression denial of service in applications using the middleware. `Ring-Defaults` users are also exposed because nested-params is enabled by default. Applications omitting the middleware do not expose this parsing path. This issue is fixed in version 1.15.5."}],"source":{"advisory":"GHSA-q2j3-fc6x-78jj","discovery":"UNKNOWN"}}}}