Pre-auth DoS in Qpid ProtonJ2 <= 1.1.0 via Type Size/Count Handling
CVE-2026-67589 Published on August 5, 2026

Apache Qpid ProtonJ2: Type size/count handling can lead to excessive allocation pre-authentication
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 ProtonJ2: through 1.1.0. Users are recommended to upgrade to version 1.2.0, which fixes the issue.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-67589 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Type

What is a Stack Exhaustion Vulnerability?

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.

CVE-2026-67589 has been classified to as a Stack Exhaustion vulnerability or weakness.


Affected Versions

Apache Software Foundation Apache Qpid ProtonJ2: