Vulnerability in Corewcf
CVE-2026-54775
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Corewcf — versions >= 1.9.0, < 1.9.1, < 1.8.1
Weakness classification (CWE)
References
- github.com/CoreWCF/CoreWCF/security/advisories/GHSA-m744-jhq9-ppw6
- github.com/CoreWCF/CoreWCF/commit/1a229d0d14a07766302f7d14c866889f04a3a624
- github.com/CoreWCF/CoreWCF/commit/6d7431ebc0ebe6521ea6d0dbea8982bac3d2bc98
- github.com/CoreWCF/CoreWCF/commit/8f95f3ac3c929409e830b5c5659683ef9f6ea6b0
- github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1
- github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1
Frequently asked questions
- What is CVE-2026-54775?
- CVE-2026-54775 is a medium-severity vulnerability in Corewcf, classified under CWE-248. CVSS score: 6.5/10. Published 2026-07-08.
- How severe is CVE-2026-54775?
- Medium severity. CVSS v3 base score is 6.5 out of 10.