CVE-2026-66273CWE-789

CVE-2026-66273

High · published August 5, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
55.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00774 · 55.3th percentile
Weakness
CWE-789 · Memory Allocation with Excessive Size Value
Published
2026-08-05T10:16Z
Affected products (1)
ProductVersionsFixed in
apache/qpid_proton-j< 0.35.00.35.0
References (2)
https://lists.apache.org/thread/z34s9v5w05qk4qqtz5fs3v9wpxz6fnbh · [email protected]http://www.openwall.com/lists/oss-security/2026/08/04/9 · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 05 AUG 05:23Z
    Apache Qpid Proton-J: Type size/count handling can lead to excessive allocation pre-authentication
    cvelistv5