Bug 2566133 (CVE-2026-120678)

Summary: CVE-2026-120678 mongo-c-driver: mongo-c-driver: Denial of Service via memory leak in compressed response handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the MongoDB C Driver. An unauthenticated attacker who controls a database server can cause a Denial of Service (DoS) against connecting client applications. Due to improper memory management when handling compressed server responses, the client library fails to release allocated memory, leading to unbounded memory consumption and application failure.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2567327, 2567329    
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Description OSIDB Bzimport 2026-11-03 19:32:30 UTC 
A memory management flaw in the MongoDB C Driver's handling of compressed responses may cause the client library to hold on to memory that is never released. An unauthenticated party that controls the database endpoint a client application connects to may cause repeated, unbounded memory growth in that application, which may result in the application becoming unavailable. No credentials, transport security settings, or user interaction are required.