CVE-2026-66273

EUVD-2026-53055
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
apacheCNA
UNKNOWN
---
Base Score
CVSS 3.x
EPSS Score
Percentile: 9%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
apacheqpid_proton-j
𝑥
≤ 0.34.1
CNA
Common Weakness Enumeration
References
https://lists.apache.org/thread/z34s9v5w05qk4qqtz5fs3v9wpxz6fnbh
http://www.openwall.com/lists/oss-security/2026/08/04/9