{"id":"CVE-2026-93761","summary":"Denial of service via unbounded regex matching in Mongoid's in-memory query matcher","details":"An inefficient regular expression complexity issue in the in-memory query evaluation component of the Mongoid library may allow an unauthenticated party to cause excessive processing within an embedding application process. Applications that place user-supplied text into a pattern-matching query condition on an embedded association may become unresponsive.","modified":"2026-09-26T03:48:39.913152416Z","published":"2026-09-18T17:20:34.623Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"7.2.0"},{"last_affected":"7.2.6"},{"introduced":"7.3.0"},{"last_affected":"7.3.5"},{"introduced":"7.4.0"},{"last_affected":"7.4.3"},{"introduced":"7.5.0"},{"last_affected":"7.5.4"},{"introduced":"7.6.0"},{"last_affected":"7.6.1"},{"introduced":"8.0.0"},{"last_affected":"8.0.12"},{"introduced":"8.1.0"},{"last_affected":"8.1.12"},{"introduced":"9.0.0"},{"last_affected":"9.0.11"},{"introduced":"9.1.0"},{"last_affected":"9.1.0"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"mongodb","cwe_ids":["CWE-1333"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93761.json"},"references":[{"type":"WEB","url":"https://jira.mongodb.org/browse/MONGOID-5981"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93761.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93761"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mongodb/mongoid","events":[{"introduced":"6e780948d297615520085d0df49dbe270c34430d"},{"fixed":"4775b2a3ced15ba4505a0f03927ada4a9a9a9f74"},{"introduced":"c95c4859ece38f2d42bf9b9984e7791532a17ff7"},{"fixed":"492a97bb60c554219a52fe07db7c161c8849b5ca"},{"introduced":"88f4b1ae86fab094b553a443dc5067493210c384"},{"fixed":"5373073d24abd206a64ab306a0af0b95a084c4f8"},{"introduced":"fc21c4106477474a655e5a4a03d829feb6997b00"},{"last_affected":"fc21c4106477474a655e5a4a03d829feb6997b00"}],"database_specific":{"cpe":["cpe:2.3:a:mongodb:mongoid:*:*:*:*:*:*:*:*","cpe:2.3:a:mongodb:mongoid:9.1.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"8.0.0"},{"fixed":"8.0.13"},{"introduced":"8.1.0"},{"fixed":"8.1.13"},{"introduced":"9.0.0"},{"fixed":"9.0.12"},{"introduced":"9.1.0"},{"last_affected":"9.1.0"}],"source":["CPE_RANGE","CPE_STRING"]}}],"versions":["9.1.0","v8.0.12","v8.1.12","v9.0.11","v9.1.0","v9.0.10","v9.0.9","v9.0.8","v9.0.7","v8.1.11","v8.0.11","v8.0.10","v8.1.10","v9.0.6","v8.0.9","v8.1.9","v9.0.5","v9.0.4","v8.1.8","v9.0.3","v8.1.7","v9.0.2","v8.1.6","v8.0.8","v9.0.1","v9.0.0","v8.1.5","v8.0.7","v8.1.4","v8.1.3","v8.0.6","v8.1.2","v8.1.1","v8.0.5","v8.1.0","v8.0.4","v8.0.3","v8.0.2","v8.0.1","v8.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93761.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}