CVE-2026-66273

7.5 HIGH

Published 2026-08-05 · Updated 2026-08-07

AI risk analysis

Summary: The flaw involves type size/count handling which can lead to excessive memory allocation, potentially causing a denial of service. This matters because attackers without authentication can exploit it to disrupt services.
Exploitability: Exploitation is relatively straightforward with preconditions including access to the affected Qpid Proton-J version.
Blast radius: If exploited, this could significantly impact availability by crashing or slowing down systems using the affected software.
Prioritized remediation: Upgrade to Qpid Proton-J version 0.35.0 immediately to mitigate the risk.

dosmemory-overflowupgrade

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

CWE-789

Vendors

apache

Products

qpid proton-j

References

https://lists.apache.org/thread/z34s9v5w05qk4qqtz5fs3v9wpxz6fnbh Mailing List, Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/08/04/9 Mailing List, Third Party Advisory

Data: NVD (public domain). Analysis: local $0 model. Defensive use only.