# CVE-2026-54775

## Summary

- **CVE ID:** CVE-2026-54775
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-248, CWE-754, CWE-755
- **Published:** Jul 8, 2026
- **Last Modified:** Jul 9, 2026

## 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

- CoreWCF — CoreWCF (>= 1.9.0, < 1.9.1)
- CoreWCF — CoreWCF (< 1.8.1)

## References

- [CNA](https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-m744-jhq9-ppw6)
- [CNA](https://github.com/CoreWCF/CoreWCF/commit/1a229d0d14a07766302f7d14c866889f04a3a624)
- [CNA](https://github.com/CoreWCF/CoreWCF/commit/6d7431ebc0ebe6521ea6d0dbea8982bac3d2bc98)
- [CNA](https://github.com/CoreWCF/CoreWCF/commit/8f95f3ac3c929409e830b5c5659683ef9f6ea6b0)
- [CNA](https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1)
- [CNA](https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.60%
- **EPSS Percentile:** 46.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._