CVE-2026-66273
Received Received - Intake

Denial of Service in Apache Qpid Proton-J

Publication date: 2026-08-05

Last updated on: 2026-08-05

Assigner: Apache Software Foundation

Description
A 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-J: through 0.34.1. Users are recommended to upgrade to version 0.35.0, which fixes the issue.

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Meta Information

Published
2026-08-05
Last Modified
2026-08-05
Generated
2026-08-05
AI Q&A
2026-08-05
EPSS Evaluated
N/A
NVD
CVE-2026-66273
EUVD
EUVD-2026-53055

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
apache qpid_proton-j to 0.35.0 (exc)
apache qpid_proton-j 0.35.0

Helpful Resources

Exploitability

CWE
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KEV
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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

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Executive Summary

This vulnerability allows a pre-authentication attacker to cause excessive memory allocation by manipulating type size or count handling. This can lead to a denial of service condition where the system becomes unresponsive or crashes due to resource exhaustion.

Impact Analysis

If you use Apache Qpid Proton-J versions before 0.35.0, an attacker could exploit this flaw to disrupt service availability. This may result in downtime, degraded performance, or complete system failure for applications relying on this library.

Mitigation Strategies

Upgrade Apache Qpid Proton-J to version 0.35.0 or later to address the vulnerability.

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