{"id":"CVE-2026-114653","title":"Silent client-side encryption bypass via unescaped field-name regex in CSFLE schema builder","summary":"A client-side encryption schema construction component in the MongoDB C# Driver places caller-supplied field identifiers into a position that is interpreted as a pattern expression, without normalizing or validating them. As a result, an…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cvssSource":"cna","cwe":["CWE-185"],"vendor":"MongoDB","product":"C# Driver","affected":["c_driver >= 3.5.0 < 3.13.0"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-30T19:27:00.154725Z"},"exploitAvailable":true,"published":"2026-10-22","updated":"2026-10-30","sourceUpdated":"2026-10-30T19:27:22.054Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-114653","references":[{"url":"https://jira.mongodb.org/browse/CSHARP-6174"},{"url":"https://github.com/mongodb/mongo-csharp-driver/releases/tag/v3.13.0"},{"url":"https://github.com/mongodb/mongo-csharp-driver/security/advisories/GHSA-ggmm-wc43-vphh"}],"tags":["cve.org","exploit-available"],"epss":0.00214,"epssPercentile":0.11822,"ingestedAt":"2026-10-22T22:00:50.447Z","slug":"CVE-2026-114653","body":"## Overview\n\nA client-side encryption schema construction component in the MongoDB C# Driver places caller-supplied field identifiers into a position that is interpreted as a pattern expression, without normalizing or validating them. As a result, an application that designates certain fields for client-side field-level encryption may have the protection silently fail to apply, so data intended to be encrypted is stored and returned in cleartext; conversely, the rule may apply more broadly than intended. No user action is required to cause the condition, and any party with ordinary read access to the stored data — without possession of the encryption keys — can observe the unprotected values.\n\n## Affected\n\n- `c_driver >= 3.5.0 < 3.13.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":233209,"id":"CVE-2026-114653","ts":1793895987729,"field":"exploit_available","old":"false","new":"true"}]}