{"id":"CVE-2026-88035","summary":"Heap buffer overflow via wrapped size check during SASL username canonicalization in MongoDB C Driver","details":"A size check in the client-side authentication path of the MongoDB C Driver can wrap around, so an unusually large user-name value is accepted and copied past the end of a small buffer. A party able to set the driver's connection settings may cause the application that embeds the driver to terminate unexpectedly. Reaching this code requires a build in which the optional external SASL authentication backend is present and a connection configured to use it.","modified":"2026-09-18T03:48:43.171156142Z","published":"2026-09-10T18:07:10.823Z","related":["openSUSE-SU-2026:11767-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88035.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"2.2.0"},{"fixed":"2.5.3"}]}],"cna_assigner":"mongodb","cwe_ids":["CWE-190"]},"references":[{"type":"WEB","url":"https://jira.mongodb.org/browse/CDRIVER-6416"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88035.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88035"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mongodb/mongo-c-driver","events":[{"introduced":"1cb8a16e863cea77a61530b832ed2c7c1dc5c065"},{"fixed":"60ce849d4e33d55963ac130b1542fe136bc0a908"},{"introduced":"9ad750264dbdf6eb23efa6859b7488a8275ae693"},{"fixed":"8b93d5956fe5b260ce73dc9269dcdeac7cf84011"}],"database_specific":{"cpe":"cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:*","extracted_events":[{"introduced":"1.10.0"},{"fixed":"1.30.10"},{"introduced":"2.2.0"},{"fixed":"2.5.3"}],"source":"CPE_RANGE"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-88035.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:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}