{"id":"CVE-2026-62864","state":"PUBLISHED","title":"Ring's nested-params middleware has inefficient regular expression complexity","description":"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.","publishedAt":"2026-10-30T20:34:42.963Z","updatedAt":"2026-10-30T20:34:42.963Z","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":["ring-clojure ring"],"affected":[{"vendor":"ring-clojure","product":"ring","versions":[{"version":"< 1.15.5","status":"affected"}]}],"references":["https://github.com/ring-clojure/ring/security/advisories/GHSA-q2j3-fc6x-78jj","https://github.com/ring-clojure/ring/commit/18738cbb8ab7504da4a5c72c9eb5fdcbf142646e","https://github.com/ring-clojure/ring/tree/1.15.5"],"weaknesses":["CWE-1333"],"ingestedAt":"2026-10-30T20:40:06.414Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/62xxx/CVE-2026-62864.json","commit":"cb8deb8a54771116d7fe7a1d93b44eaca9c11863","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62864","state":"PUBLISHED","datePublished":"2026-10-30T20:34:42.963Z","dateUpdated":"2026-10-30T20:34:42.963Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-14T21:10:50.032Z"},"containers":{"cna":{"title":"Ring's nested-params middleware has inefficient regular expression complexity","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."}],"affected":[{"vendor":"ring-clojure","product":"ring","versions":[{"version":"< 1.15.5","status":"affected"}]}],"references":[{"url":"https://github.com/ring-clojure/ring/security/advisories/GHSA-q2j3-fc6x-78jj","name":"https://github.com/ring-clojure/ring/security/advisories/GHSA-q2j3-fc6x-78jj","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/ring-clojure/ring/commit/18738cbb8ab7504da4a5c72c9eb5fdcbf142646e","name":"https://github.com/ring-clojure/ring/commit/18738cbb8ab7504da4a5c72c9eb5fdcbf142646e","tags":["x_refsource_MISC"]},{"url":"https://github.com/ring-clojure/ring/tree/1.15.5","name":"https://github.com/ring-clojure/ring/tree/1.15.5","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-1333","lang":"en","description":"CWE-1333: Inefficient Regular Expression Complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-30T20:34:42.963Z"},"source":{"advisory":"GHSA-q2j3-fc6x-78jj","discovery":"UNKNOWN"}}}}}