{"id":"CVE-2026-9743","summary":"Aggregation sub-pipeline null dereference may allow DoS via crafted getMore","details":"In MongoDB Server 8.0, an aggregation stage can leave its _subPipeline field null during processing of certain pipelines. If a getMore is subsequently issued on the same cursor, the server may dereference this null sub-pipeline when reattaching to the operation context, accessing an invalid address and crashing the process. This issue allows an authenticated user who can run aggregation pipelines to cause a denial of service by issuing a specially crafted aggregation followed by getMore on affected versions.","aliases":["BIT-mongodb-2026-9743"],"modified":"2026-07-15T01:49:10.198482964Z","published":"2026-06-09T21:59:34.669Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9743.json","unresolved_ranges":[{"extracted_events":[{"introduced":"8.0.0"},{"fixed":"8.0.24"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"mongodb","cwe_ids":["CWE-476"]},"references":[{"type":"WEB","url":"https://jira.mongodb.org/browse/SERVER-123688"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9743.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9743"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mongodb/mongo","events":[{"introduced":"b41cda4fe697dce6fd9b83b3805362ccc02fbeb3"},{"fixed":"d0ad95914a3351a12faf03ba35d41c43bc6feb7e"}],"database_specific":{"source":"CPE_RANGE","cpe":"cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"8.0.0"},{"fixed":"8.0.24"}]}}],"versions":["r8.0.17-alpha0","r8.0.16-rc1","r8.0.16","r8.0.16-rc0","r8.0.14-rc1","r8.0.14","r8.0.14-rc0","r8.0.13-rc2","r8.0.13","r8.0.13-rc1","r8.0.13-rc0","r8.0.12-rc0","r8.0.12","r8.0.10-rc0","r8.0.10","r8.0.6","r8.0.5-rc2","r8.0.5","r8.0.5-rc1","r8.0.5-rc0","r8.0.4-rc0","r8.0.4","r8.0.3","r8.0.2","r8.0.1-rc0","r8.0.1","r8.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-9743.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}