Bug 2566161 (CVE-2026-120954)

Summary: CVE-2026-120954 mongo-c-driver: mongo-c-driver: data integrity compromise via arithmetic wraparound in binary vector parsing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in mongo-c-driver. When handling specialized binary vector data on 32-bit systems, an arithmetic wraparound vulnerability allows a remote attacker to compromise data integrity by providing an oversized value in untrusted Binary JSON (BSON) data. This issue causes the application to parse only a fraction of the elements while reporting success, resulting in inconsistent and inaccurate data processing.
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Bug Depends On: 2567222, 2567223    
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Description OSIDB Bzimport 2026-11-03 19:47:20 UTC 
A weakness in the BSON library's handling of a specialized binary vector data type allows an arithmetic wraparound when computing the number of elements described by an oversized attacker-supplied value. On builds where the platform word size is 32 bits, an application that parses untrusted BSON data can be made to process only a small fraction of the supplied elements while the operation reports success, producing results that disagree with byte-oriented accessors and with 64-bit builds of the same library. No authentication or user interaction is required beyond getting the application to parse the data. The impact is limited to data integrity; memory safety is not affected and no information is disclosed.