CVE-2026-54775Network attack vector

Persistent endpoint denial via unhandled Kafka tombstones

Published Jul 8, 2026 · Updated Jul 8, 2026

Denial of service in CoreWCF.Kafka before 1.8.1 and in 1.9.0 allows remote authenticated users to halt topic processing. KafkaTransportPump fails to check a null-value tombstone before processing it, allowing an exception to escape the consume loop and permanently stop further reads. Produce/write permission on a consumed topic is required unless anonymous publishing is enabled, and later records remain unprocessed.

CVSS severity6.5
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in CoreWCF.Kafka before 1.8.1 and in 1.9.0 allows remote authenticated users to halt topic processing. KafkaTransportPump fails to check a null-value tombstone before processing it, allowing an exception to escape the consume loop and permanently stop further reads. Produce/write permission on a consumed topic is required unless anonymous publishing is enabled, and later records remain unprocessed.

The record

CVE
CVE-2026-54775
Published
Jul 8, 2026
Updated
Jul 8, 2026
Vendor
CoreWCF
Product
CoreWCF
Classifications
CWE-755, CWE-754, CWE-248, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.8.1
  2. Affected versionversion=>= 1.9.0, < 1.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

CoreWCF · CoreWCFversion=< 1.8.1; version=>= 1.9.0, < 1.9.1

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-755Improper Handling of Exceptional Conditions
CWE-754Improper Check for Unusual or Exceptional Conditions
CWE-248Uncaught Exception
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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