CVE-2026-67551

Analyzed Analyzed - Analysis Complete

Excessive Allocation in Apache Qpid Proton-Dotnet

Publication date: 2026-08-05

Last updated on: 2026-08-07

Assigner: Apache Software Foundation

Description

pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to potential denial of service. This issue affects Apache Qpid Proton-Dotnet: through 1.0.0. Users are recommended to upgrade to version 1.1.0, which fixes the issue.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-05

Last Modified

2026-08-07

Generated

2026-08-17

AI Q&A

2026-08-05

EPSS Evaluated

2026-08-16

NVD

CVE-2026-67551

EUVD

EUVD-2026-53057

Affected Vendors & Products

Vendor	Product	Version / Range
apache	qpid_proton-dotnet	to 1.1.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-789	The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.

Attack-Flow Graph

Executive Summary

This vulnerability allows a pre-authentication attacker to exploit improper handling of type size and count in Apache Qpid Proton-Dotnet versions up to 1.0.0. By manipulating these values, the attacker can trigger excessive memory allocation, leading to a denial of service condition.

Detection Guidance

This vulnerability involves excessive allocation due to improper type size/count handling, which could lead to denial of service. Detection may require monitoring for unusual memory allocation patterns or crashes in Apache Qpid Proton-Dotnet versions before 1.1.0. Check logs for excessive memory usage or application failures.

Impact Analysis

If you use Apache Qpid Proton-Dotnet through version 1.0.0, an attacker could exploit this flaw to crash your application or system by consuming excessive memory, disrupting normal operations.

Compliance Impact

This vulnerability is a denial of service issue caused by excessive allocation due to improper type size handling. It does not directly impact data confidentiality or integrity, which are key concerns for GDPR and HIPAA. However, prolonged denial of service could indirectly affect compliance by disrupting access to critical systems.

Mitigation Strategies

Upgrade Apache Qpid Proton-Dotnet to version 1.1.0 or later to address the vulnerability.

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