CVE-2026-84965
An integer wraparound in an allocation size calculation in the BSON library's JSON parsing code can cause a buffer to be released while a following copy operation still writes through the stale pointer. On builds where sizes are 32 bits, an unauthenticated party able to supply a sufficiently large JSON input to an application that links the library may cause that application to terminate unexpectedly, resulting in denial of service.
- Published Sep 3, 2026
- CVSS 5.9 medium
- 0.1% chance of exploitation in the next 30 days (EPSS)