{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-9740: Unbounded recursion in BSONColumn interleaved-reference causes pre-auth stack overflow","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-9740","status":"final","version":"1","initial_release_date":"2026-06-09T22:43:44.291Z","current_release_date":"2026-06-10T18:16:38.879Z","revision_history":[{"date":"2026-06-09T22:43:44.291Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"A vulnerability in MongoDB Server's BSON validation logic allows an unauthenticated user to crash the mongod process by sending a specially crafted message. The BSON validator's handling of certain nested binary data structures permits uncontrolled mutual recursion between validation functions, where each re-entry resets internal depth tracking.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-9740 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-9740"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-9740"},{"category":"external","summary":"jira.mongodb.org","url":"https://jira.mongodb.org/browse/SERVER-125063"}]},"product_tree":{"branches":[{"category":"vendor","name":"MongoDB","branches":[{"category":"product_name","name":"MongoDB Server","branches":[{"category":"product_version_range","name":">=8.3.0 <8.3.3","product":{"name":"MongoDB MongoDB Server >=8.3.0 <8.3.3","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:mongodb:mongodb_server:*:*:*:*:*:*:*:*"}}},{"category":"product_version_range","name":">=8.2.0 <8.2.10","product":{"name":"MongoDB MongoDB Server >=8.2.0 <8.2.10","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:mongodb:mongodb_server:*:*:*:*:*:*:*:*"}}},{"category":"product_version_range","name":">=8.0.0 <8.0.24","product":{"name":"MongoDB MongoDB Server >=8.0.0 <8.0.24","product_id":"CSAFPID-3","product_identification_helper":{"cpe":"cpe:2.3:a:mongodb:mongodb_server:*:*:*:*:*:*:*:*"}}},{"category":"product_version_range","name":">=7.0.0 <7.0.35","product":{"name":"MongoDB MongoDB Server >=7.0.0 <7.0.35","product_id":"CSAFPID-4","product_identification_helper":{"cpe":"cpe:2.3:a:mongodb:mongodb_server:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-9740","title":"Unbounded recursion in BSONColumn interleaved-reference causes pre-auth stack overflow","notes":[{"category":"description","text":"A vulnerability in MongoDB Server's BSON validation logic allows an unauthenticated user to crash the mongod process by sending a specially crafted message. The BSON validator's handling of certain nested binary data structures permits uncontrolled mutual recursion between validation functions, where each re-entry resets internal depth tracking.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","baseScore":8.7,"baseSeverity":"HIGH"},"products":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 7.0.35, 8.0.24, 8.2.10, 8.3.3.","product_ids":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4"]}]}]}