CVE-2026-66273
Apache Qpid Proton-J: Type size/count handling can lead to excessive allocation pre-authentication
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.
INFO
Published Date :
Aug. 5, 2026, 6:16 a.m.
Last Modified :
Aug. 5, 2026, 6:16 a.m.
Remotely Exploit :
No
Source :
[email protected]
Solution
- Upgrade Apache Qpid Proton-J to 0.35.0.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-66273.
| URL | Resource |
|---|---|
| https://lists.apache.org/thread/z34s9v5w05qk4qqtz5fs3v9wpxz6fnbh |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-66273 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-66273
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-66273 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-66273 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Aug. 05, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Apache Software Foundation', 'product': 'Apache Qpid Proton-J', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'semver', 'lessThanOrEqual': '0.34.1'}], 'packageName': 'org.apache.qpid:proton-j', 'collectionURL': 'https://repo.maven.apache.org/maven2', 'defaultStatus': 'unaffected'}] Added 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. Added CWE CWE-789 Added Reference https://lists.apache.org/thread/z34s9v5w05qk4qqtz5fs3v9wpxz6fnbh