Vulnerability-Lookup

GHSA-M744-JHQ9-PPW6

Vulnerability from github – Published: 2026-06-19 20:46 – Updated: 2026-06-19 20:46

Summary

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

Details

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

Severity

6.5 (Medium)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "CoreWCF.Kafka"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "CoreWCF.Kafka"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.9.0"
            },
            {
              "fixed": "1.9.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54775"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-248",
      "CWE-754",
      "CWE-755"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-19T20:46:49Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\nA CoreWCF service is running and listening on a Kafka topic receiving a null-value record will stop processing new records from that topic.\n\n#### Preconditions\nThe attacker has produce/write permission on a topic that CoreWCF is consuming from. If the broker permits anonymous publishes, no authentication is required. \n\n### Patches\nFixed in CoreWCF v1.8.1 and v1.9.1\n\n### Workarounds\nOnly allow authenticated writes to a topic",
  "id": "GHSA-m744-jhq9-ppw6",
  "modified": "2026-06-19T20:46:49Z",
  "published": "2026-06-19T20:46:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-m744-jhq9-ppw6"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/CoreWCF/CoreWCF"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "CoreWCF: Kafka consume pump halts permanently on a Kafka tombstone (null-value record), causing persistent endpoint denial of service."
}

CVE-2026-54775 (GCVE-0-2026-54775)

Vulnerability from cvelistv5 – Published: 2026-07-08 22:13 – Updated: 2026-07-09 14:20

Title

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

Summary

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.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-09 14:20 UTC

CWE

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

Assigner

GitHub_M mitre root

References

6 references

URL	Tags
https://github.com/CoreWCF/CoreWCF/security/advis…	x_refsource_CONFIRM
https://github.com/CoreWCF/CoreWCF/commit/1a229d0…	x_refsource_MISC
https://github.com/CoreWCF/CoreWCF/commit/6d7431e…	x_refsource_MISC
https://github.com/CoreWCF/CoreWCF/commit/8f95f3a…	x_refsource_MISC
https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1	x_refsource_MISC
https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
CoreWCF	CoreWCF	Affected: >= 1.9.0, < 1.9.1 Affected: < 1.8.1

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JSON

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      "metrics": [
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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