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.
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Fixes
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Workaround
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References
| Link | Providers |
|---|---|
| https://jira.mongodb.org/browse/CDRIVER-6405 |
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History
Thu, 03 Sep 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | Heap write primitive via size round-up wrap during JSON parsing on 32-bit builds | |
| Weaknesses | CWE-190 | |
| References |
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| Metrics |
cvssV3_1
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MITRE
Status: PUBLISHED
Assigner: mongodb
Published:
Updated: 2026-09-03T15:44:49.921Z
Reserved: 2026-09-02T17:58:52.742Z
Link: CVE-2026-84965
Vulnrichment
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NVD
Status : Awaiting Analysis
Published: 2026-09-03T16:18:25.417
Modified: 2026-09-03T16:25:43.557
Link: CVE-2026-84965
Redhat
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OpenCVE Enrichment
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Weaknesses