{"id":"DEBIAN-CVE-2026-81521","details":"The MongoDB Go Driver's client-level bulk write operation may accept a caller-supplied database name containing a reserved separator character without escaping it before the name is used to build the target namespace for the operation. An application that passes untrusted input as a database name could therefore have the write directed at a database and collection other than the ones it intended. Only the Client.BulkWrite API is affected.","modified":"2026-09-30T08:47:35.100191032Z","published":"2026-08-27T20:18:50.350Z","upstream":["CVE-2026-81521"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-81521"}],"affected":[{"package":{"name":"golang-mongodb-mongo-driver","ecosystem":"Debian:12","purl":"pkg:deb/debian/golang-mongodb-mongo-driver?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.12.1+ds1-1","1.12.1+ds1-2","1.16.1+ds1-1","1.17.0+ds1-1","1.17.1+ds1-1","1.17.1+ds1-2","1.17.1+ds1-3","1.17.9+ds1-1","1.8.4+ds1-3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-81521.json"}},{"package":{"name":"golang-mongodb-mongo-driver","ecosystem":"Debian:13","purl":"pkg:deb/debian/golang-mongodb-mongo-driver?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.17.1+ds1-2","1.17.1+ds1-3","1.17.9+ds1-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-81521.json"}},{"package":{"name":"golang-mongodb-mongo-driver","ecosystem":"Debian:14","purl":"pkg:deb/debian/golang-mongodb-mongo-driver?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.17.1+ds1-2","1.17.1+ds1-3","1.17.9+ds1-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-81521.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}