{"id":"CVE-2026-81523","summary":"Cross-tenant database retargeting via dot/NUL injection in namespace strings in libmongocrypt","details":"A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-supplied database identifier to be accepted without sanitization. The resulting impact is limited to incorrect schema selection, which may lead to limited disclosure or modification of information handled by the application.","modified":"2026-08-30T03:30:44.279898405Z","published":"2026-08-27T18:32:24.206Z","database_specific":{"cna_assigner":"mongodb","cwe_ids":["CWE-74"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81523.json"},"references":[{"type":"WEB","url":"https://github.com/mongodb/libmongocrypt/releases/tag/1.20.3"},{"type":"WEB","url":"https://jira.mongodb.org/browse/MONGOCRYPT-977"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81523.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81523"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mongodb/libmongocrypt","events":[{"introduced":"db663b458b8680df9b81ff8cde7053633c155fb6"},{"fixed":"f12c437858d25a06d55e0a14433d39ef3aa862f4"}],"database_specific":{"extracted_events":[{"introduced":"1.0.0"},{"fixed":"1.20.3"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["1.20.2","1.20.1","1.20.0","pymongocrypt-1.18.1","pymongocrypt-1.18.0","pymongocrypt-1.18.0.dev0","pymongocrypt-1.17.0","pymongocrypt-1.16.0","pymongocrypt-1.15.1","pymongocrypt-1.15.0","pymongocrypt-1.14.1","pymongocrypt-1.14.0","pymongocrypt-1.13.0","pymongocrypt-1.12.2","pymongocrypt-1.12.2rc4","pymongocrypt-1.12.2rc2","pymongocrypt-1.12.2rc1","pymongocrypt-1.2.2rc0","pymongocrypt-1.12.1","pymongocrypt-1.12.0","pymongocrypt-1.11.0","java-1.11.0","csharp-v1.11.0","pymongocrypt-1.10.1","csharp-v1.10.0","pymongocrypt-1.10.0","1.10.0b1","1.10.0b0","pymongocrypt-1.9.1","node-v6.0.1","csharp-v1.9.0","pymongocrypt-1.9.0","csharp-v1.8.2","csharp-v1.8.1","pymongocrypt-1.8.0","node-v2.9.0","node-v6.0.0","node-v6.0.0-alpha.3","node-v6.0.0-alpha.2","pymongocrypt-1.7.0","pymongocrypt-1.6.1","csharp-v1.8.0","node-v2.8.0","pymongocrypt-1.6.0","1.8.0-alpha1","pymongocrypt-1.5.2","csharp-v1.8.0-alpha.0","java-1.8.0-alpha0","node-v2.8.0-alpha.0","1.8.0-alpha0","node-v2.7.1","node-v2.7.0","node-v2.7.0-alpha.0","node-v2.6.0","node-v2.6.0-alpha.0","pymongocrypt-1.5.1","node-v2.5.0","node-v2.4.0","pymongocrypt-1.5.0","node-v2.4.0-alpha.2","node-v2.4.0-alpha.1","csharp-v1.7.0","node-v2.4.0-alpha.0","1.7.0-alpha2","1.7.0-alpha1","pymongocrypt-1.4.1","1.7.0-alpha0","pymongocrypt-1.4.0","node-v2.3.0","node-v2.2.1","csharp-v1.6.0","node-v2.2.0","java-1.6.0-alpha0","1.6.0-alpha0","csharp-v1.5.5","pymongocrypt-1.3.1","node-v2.2.0-alpha.6","node-v2.2.0-alpha.5","pymongocrypt-1.3.0","csharp-v1.5.4","node-v2.2.0-alpha.4","node-v2.2.0-alpha.3","csharp-v1.5.2","1.5.0-rc2","node-v2.2.0-alpha.2","pymongocrypt-1.3.0b0","1.5.0-rc1","csharp-v1.5.1","csharp-v1.5.0","node-v2.2.0-alpha.1","1.5.0-rc0","1.5.0-alpha2","node-v2.2.0-alpha.0","1.5.0-alpha1","1.5.0-alpha0","node-v2.1.0","1.3.1","1.4.0-alpha0","node-v2.0.0","node-v2.0.0-beta.4","node-v2.0.0-beta.3","csharp-v1.3.0","pymongocrypt-1.2.0","pymongocrypt-1.1.2","1.3.0","1.3.0-beta1","node-v2.0.0-beta.0","node-v1.2.7","1.2.2","csharp-v1.2.3","csharp-v1.2.2","pymongocrypt-1.1.1","1.2.1","node-v1.2.6","node-v1.2.5","node-v1.2.4","node-v1.2.3","node-v1.2.2","1.2.0","pymongocrypt-1.1.0","node-v1.2.1","node-v1.2.0","csharp-v1.2.1","csharp-v1.2.0","debian/1.1.0-1","1.1.0","csharp-v1.1.0-beta04","csharp-v1.1.0-beta03","pymongocrypt-1.1.0b0","csharp-v1.1.0-beta02","csharp-v1.1.0-beta01","1.1.0-beta1","1.0.4","pymongocrypt-1.0.1","node-v1.1.0","1.0.3","1.0.2","1.0.1","1.0.1-rc0","node-v1.0.1","node-v1.0.0","pymongocrypt-1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81523.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"}]}