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.

bson-devel-2.5.2-1.1 on GA media

Affected: Ubuntu:Pro:20.04:LTS: mongo-c-driver, Ubuntu:Pro:22.04:LTS: mongo-c-driver, Ubuntu:Pro:24.04:LTS: mongo-c-driver, Ubuntu:26.04:LTS: mongo-c-driver

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.