Bug 2548186 (CVE-2026-106428)

Summary: CVE-2026-106428 mongo-c-driver: mongo-c-driver: Denial of Service via malformed SCRAM authentication response
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 the MongoDB C Driver. An out-of-bounds read occurs when the driver parses malformed responses during Salted Challenge Response Authentication Mechanism (SCRAM) authentication. A malicious server or network intermediary can exploit this flaw by sending a crafted response before signature verification, causing the client application to terminate and resulting in a Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2548582, 2548583, 2548584    
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Description OSIDB Bzimport 2026-10-08 19:03:51 UTC 
An out-of-bounds read in SCRAM authentication response parsing in the MongoDB C Driver can read one byte beyond a fixed-size buffer when processing a malformed server-final message. A server or network intermediary able to provide this message before server-signature verification can cause the application using the driver to terminate. The extra byte is not returned through the protocol.