{"id":"UBUNTU-CVE-2026-120954","details":"A weakness in the BSON library's handling of a specialized binary vector data type allows an arithmetic wraparound when computing the number of elements described by an oversized attacker-supplied value. On builds where the platform word size is 32 bits, an application that parses untrusted BSON data can be made to process only a small fraction of the supplied elements while the operation reports success, producing results that disagree with byte-oriented accessors and with 64-bit builds of the same library. No authentication or user interaction is required beyond getting the application to parse the data. The impact is limited to data integrity; memory safety is not affected and no information is disclosed.","modified":"2026-11-05T11:47:27.884059756Z","published":"2026-11-03T19:18:00Z","upstream":["CVE-2026-120954"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-120954"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-120954"},{"type":"REPORT","url":"https://jira.mongodb.org/browse/CDRIVER-6420"}],"affected":[{"package":{"name":"mongo-c-driver","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/mongo-c-driver?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.15.0-1","1.15.1-1","1.15.2-1","1.16.0-1","1.16.1-1","1.16.1-1build1","1.16.1-1build2","1.16.1-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.16.1-1ubuntu0.1~esm1","binary_name":"libbson-1.0-0"},{"binary_name":"libmongoc-1.0-0","binary_version":"1.16.1-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120954.json"}},{"package":{"name":"mongo-c-driver","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/mongo-c-driver?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.18.0-1","1.19.1-1","1.19.2-1","1.20.0-1","1.20.0-1build1","1.20.1-1","1.21.0-1","1.21.0-1build1","1.21.0-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.21.0-1ubuntu0.1~esm1","binary_name":"libbson-1.0-0"},{"binary_name":"libmongoc-1.0-0","binary_version":"1.21.0-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120954.json"}},{"package":{"name":"mongo-c-driver","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/mongo-c-driver?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.24.3-1","1.24.4-1","1.25.1-1","1.25.2-1","1.25.4-1","1.26.0-1","1.26.0-1.1ubuntu1","1.26.0-1.1ubuntu2","1.26.0-1.1ubuntu2+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.26.0-1.1ubuntu2+esm1","binary_name":"libbson-1.0-0t64"},{"binary_name":"libmongoc-1.0-0t64","binary_version":"1.26.0-1.1ubuntu2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120954.json"}},{"package":{"name":"mongo-c-driver","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/mongo-c-driver?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.2-1","2.3.1-1","2.3.2-1","2.3.3-1build1","2.5.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libbson2-2","binary_version":"2.5.0-1"},{"binary_version":"2.5.0-1","binary_name":"libmongoc2-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120954.json"}},{"package":{"name":"mongo-c-driver","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/mongo-c-driver?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.30.4-1ubuntu1","2.2.0-1","2.2.1-1","2.2.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libbson2-2","binary_version":"2.2.2-1"},{"binary_name":"libmongoc2-2","binary_version":"2.2.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120954.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}