Apache Qpid Proton-J pre-auth CVE-2026-66274 DoS via stack overflow (up to 0.34.1)
CVE-2026-66274 Published on August 5, 2026

Apache Qpid Proton-J: Unbounded type nesting can lead to pre-authentication stackoverflow
A pre-authentication attacker could leverage type nesting to cause a StackOverflowError potentially leading to 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.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-66274 is exploitable 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 does not properly control the amount of recursion which takes place, consuming excessive resources, such as allocated memory or the program stack.

CVE-2026-66274 has been classified to as a Stack Exhaustion vulnerability or weakness.


Affected Versions

Apache Software Foundation Apache Qpid Proton-J: