{"id":"CVE-2026-88026","summary":"Regular expression injection via unescaped characters in LINQ query translation in MongoDB C# Driver","details":"Improper neutralization of regular-expression metacharacters in the LINQ query translation component of the MongoDB C# Driver can cause a caller-supplied character sequence to alter a regular-expression predicate generated by an affected application. An authenticated user who can influence such a value may cause the application to return records beyond those intended by the original filter.","modified":"2026-10-01T03:47:39.490934808Z","published":"2026-09-10T17:48:39.431Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"2.14.0"},{"last_affected":"3.11.1"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"mongodb","cwe_ids":["CWE-943"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88026.json"},"references":[{"type":"WEB","url":"https://jira.mongodb.org/browse/CSHARP-6177"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88026.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88026"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mongodb/mongo-csharp-driver","events":[{"introduced":"2b37a1fe1cbdbe1a020b52b77f1197b6d77575e7"},{"fixed":"53e865892f159ae2c61f69f2203ac6da4c02ff16"}],"database_specific":{"extracted_events":[{"introduced":"2.14.0"},{"fixed":"3.11.2"}],"source":"CPE_RANGE","cpe":"cpe:2.3:a:mongodb:c\\#_driver:*:*:*:*:*:mongodb:*:*"}}],"versions":["v3.11.1","v3.11.0","v3.10.0","v3.9.0","v3.8.0","v3.7.1","v3.7.0","v3.6.0","v3.5.0","v3.4.0","v3.3.0","v3.2.1","v3.2.0","v3.1.0","v3.0.0","v2.28.0","v2.27.0","v2.26.0","v2.25.0","v2.24.0","v2.23.1","v2.23.0","v2.22.0","v2.21.0","v2.20.0","v2.19.0","v2.18.0","v2.17.0","v2.16.0","v2.15.0","v2.14.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-88026.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}]}