UBUNTU-CVE-2026-84966

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Source
https://ubuntu.com/security/CVE-2026-84966
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84966.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-84966
Upstream
Published
2026-09-03T16:18:00Z
Modified
2026-10-17T13:01:12Z
Severity
  • 5.1 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • 5.9 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

An incorrect numeric type conversion in the BSON document building component of the MongoDB C++ Driver may cause a length value to be interpreted incorrectly. When an application supplies an extremely large, non-terminated field name to the builder, the library may read memory outside the intended buffer and terminate the calling process. No authentication is required, but the calling application must pass the oversized name in a specific form.

References

Affected packages

Ubuntu:26.10 / mongo-cxx-driver

Package

Name
mongo-cxx-driver
Purl
pkg:deb/ubuntu/mongo-cxx-driver?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.4.0-1
4.5.0-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libbsoncxx1-1",
            "binary_version":  "4.5.0-1"
        },
        {
            "binary_name":  "libmongocxx1-1",
            "binary_version":  "4.5.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84966.json"