CVE-2026-84965 — Heap write primitive via size round-up wrap during JSON parsing on 32-bit builds

CVE-2026-84965

Heap write primitive via size round-up wrap during JSON parsing on 32-bit builds PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
MongoDB / C Driver	affected 1.10.0 before 1.30.9; affected 2.0.0 before 2.5.2

CWE

CWE-190

References

https://jira.mongodb.org/browse/CDRIVER-6405

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.