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Medium, CVSS 6.5

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

CVE-2026-54775GHSA-m744-jhq9-ppw6

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (corewcf.kafka 1.9.1, 1.8.1), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • NuGet corewcf.kafka

    Affected
    < 1.8.1>= 1.9.0, < 1.9.1
    Fixed in
    1.8.1, 1.9.1

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.5 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2026-54775: 0.60% estimated exploitation activity in the next 30 days; percentile 48.68 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact A CoreWCF service is running and listening on a Kafka topic receiving a null-value record will stop processing new records from that topic. Preconditions The attacker has produce/write permission on a topic that CoreWCF is consuming from. If the broker permits anonymous publishes, no authentication is required. Patches Fixed in CoreWCF v1.8.1 and v1.9.1 Workarounds Only allow authenticated writes to a topic

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-m744-jhq9-ppw6

Agent brief

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# Patch Next advisory brief: CVE-2026-54775

Advisory: CoreWCF: Kafka consume pump halts permanently on a Kafka tombstone (null-value record), causing persistent endpoint denial of service.
IDs: CVE-2026-54775, GHSA-m744-jhq9-ppw6
Record: https://patchnext.com/advisories/cve-2026-54775 (revision 1, source checked 26 Oct 2026, 17:04 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: corewcf.kafka 1.9.1, 1.8.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet corewcf.kafka: affected < 1.8.1; >= 1.9.0, < 1.9.1; fixed in 1.8.1, 1.9.1

## Suggested inspection (read-only)
- NuGet corewcf.kafka: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on corewcf.kafka.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-m744-jhq9-ppw6 (GitHub-reviewed advisory GHSA-m744-jhq9-ppw6 lists affected ranges: NuGet corewcf.kafka >=0 =1.9.0 <1.9.1)

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