Bug 2468432 (CVE-2026-6664)

Summary: CVE-2026-6664 PgBouncer: PgBouncer: Denial of Service via malformed SCRAM authentication packet
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 PgBouncer. An integer overflow in the network packet parsing code allows an unauthenticated remote attacker to bypass a boundary check by sending a malformed SCRAM authentication packet. This can lead to a crash, resulting in a Denial of Service (DoS) for the PgBouncer instance.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2477909, 2477910    
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Description OSIDB Bzimport 2026-05-09 02:01:26 UTC
An integer overflow in network packet parsing code in PgBouncer before 1.25.2 bypasses a boundary check and can lead to a crash. An unauthenticated remote attacker can crash PgBouncer with a malformed SCRAM authentication packet.