{"id":"CVE-2026-81522","title":"A weakness in the MongoDB C++ Driver's handling of caller-supplied namespace identifiers allows special characters embedded in those identifiers","summary":"A weakness in the MongoDB C++ Driver's handling of caller-supplied namespace identifiers allows special characters embedded in those identifiers. An application that builds a namespace identifier from untrusted input without validating i…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-116"],"published":"2026-08-27","updated":"2026-08-29","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-81522","references":[{"url":"https://github.com/mongodb/mongo-cxx-driver/releases/tag/r4.5.1","label":"cna@mongodb.com"},{"url":"https://jira.mongodb.org/browse/CXX-3552","label":"cna@mongodb.com"}],"tags":["nvd"],"epss":0.00265,"epssPercentile":0.18647,"ingestedAt":"2026-08-29T21:42:36.301Z","slug":"CVE-2026-81522","body":"## Overview\n\nA weakness in the MongoDB C++ Driver's handling of caller-supplied namespace identifiers allows special characters embedded in those identifiers. An application that builds a namespace identifier from untrusted input without validating it may therefore have its operation directed at a different target than intended. This can result in limited unauthorized read and write access to data belonging to another logical tenant of the affected application.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}