Bug 2548194 (CVE-2026-106437)

Summary: CVE-2026-106437 mongo-c-driver: mongo-c-driver: Denial of Service via integer underflow in bson_reserve_buffer
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: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in mongo-c-driver. An attacker who can influence the buffer length supplied by an embedding application can trigger an integer underflow by passing an undersized value to the Binary JSON (BSON) buffer-reservation function. This issue leads to out-of-bounds memory reads and writes during subsequent document operations, which can cause a Denial of Service (DoS) through application crashes, memory corruption, or information disclosure.
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Bug Depends On: 2548587, 2548588    
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Description OSIDB Bzimport 2026-10-08 19:05:38 UTC 
The BSON buffer-reservation API in the MongoDB C Driver can record a length smaller than the five-byte BSON minimum. Later append or comparison operations can underflow unsigned length calculations and read or write outside the document buffer. An actor who can influence the length supplied by an embedding application can cause the application to terminate or read or corrupt adjacent process memory. Reaching this issue requires the application to pass an undersized value to bson_reserve_buffer and then perform an affected operation.