Bug 2548185 (CVE-2026-106431)

Summary: CVE-2026-106431 mongo-c-driver: mongo-c-driver: Denial of Service via off-by-one error in BSON bulk document writer
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in mongo-c-driver. An off-by-one error in the BSON bulk document writer allows an attacker to cause a Denial of Service (DoS) or memory corruption. By supplying documents of a specific cumulative size that align with a buffer boundary, an attacker can trigger a single-byte out-of-bounds write past allocated memory, terminating the affected process.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2548585, 2548586    
Bug Blocks:    

Description OSIDB Bzimport 2026-10-08 19:03:16 UTC 
An off-by-one error in the BSON bulk document writer in the MongoDB C Driver can write one zero byte immediately past a heap allocation when a document ends at a specific buffer boundary. An actor who can influence the size of documents serialized by an embedding application can corrupt adjacent process memory or terminate the process. Reaching this issue requires the application to use the BSON bulk-writer API and produce a precise cumulative document size.