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Medium · 6.5 CVE-2026-54775 EUVD-2026-42466GHSA-m744-jhq9-ppw6

CoreWCF: Kafka consume pump halts permanently on a Kafka tombstone (null-value record), causing persistent endpoint denial of service.

Published Jul 8, 2026 · Updated Jul 9, 2026 · Assigned by GitHub_M

Description

CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, a CoreWCF service listening on a Kafka topic stops processing new records from that topic when KafkaTransportPump receives a null-value tombstone record, causing a persistent endpoint denial of service for attackers with produce permission. This issue is fixed in versions 1.8.1 and 1.9.1.

Affected products

VendorProductAffectedFixed
CoreWCF CoreWCF >= 1.9.0, < 1.9.1, < 1.8.1 —

Affected packages

EcosystemPackageAffectedFixedRecord
NuGet CoreWCF.Kafka < 1.8.1 1.8.1 GHSA-m744-jhq9-ppw6
NuGet CoreWCF.Kafka >= 1.9.0, < 1.9.1 1.9.1 GHSA-m744-jhq9-ppw6

References