CVE-2026-66273: qpid proton-j before 0.35.0 (exclusive); +1 more affected products

CVE-2026-66273. CVSS 3.1 base score 7.5 (HIGH, Source advisory). EPSS 0.00774 (percentile 0.55268), scored 22-Oct-2026.

Affected technology

qpid proton-j · before 0.35.0 (exclusive)
apache

Apache Qpid Proton-J · 0 through 0.34.1
Apache Software Foundation

Component: Not specified by the source

Attack conditions (Source advisory, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

A pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to potential denial of service. Source advisory’s CVSS 3.1 assessment (base score 7.5/10) rates confidentiality and integrity impact as none; availability impact as high.

Published 24-Oct-2026 01:43 UTC

CWE: CWE-789
CCR priority: 30.2 /100 (P4)
CVSS 3.1: 7.5 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · Source advisory
EPSS: 0.00774 · percentile 0.55268 · 2026-10-22
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-24 01:40:49.068977+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-66273.html