{"id":"UBUNTU-CVE-2026-81522","details":"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 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.","modified":"2026-10-17T13:01:10.379726831Z","published":"2026-08-27T20:18:00Z","upstream":["CVE-2026-81522"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-81522"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-81522"},{"type":"REPORT","url":"https://jira.mongodb.org/browse/CXX-3552"},{"type":"REPORT","url":"https://github.com/mongodb/mongo-cxx-driver/releases/tag/r4.5.1"}],"affected":[{"package":{"name":"mongo-cxx-driver","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/mongo-cxx-driver?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.0-1","4.5.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libbsoncxx1-1","binary_version":"4.5.0-1"},{"binary_name":"libmongocxx1-1","binary_version":"4.5.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-81522.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}