CVE-2026-67591mediumCWE-770

CVE-2026-67591: medium-severity vulnerability in Apache Qpid ProtonJ2

Apache Qpid ProtonJ2: Incoming session flow control window can be exceeded

Published · Updated

Follow this CVE+ Monitor Apache Qpid ProtonJ2

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.5epss 0.7%
An authenticated attacker could exceed the session flow control incoming window potentially leading to denial of service. This issue affects Apache Qpid ProtonJ2: through 1.1.0. Users are recommended to upgrade to version 1.2.0, which fixes the issue.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products
Apache Software Foundation · Apache Qpid ProtonJ2
Related CVEs — Apache Qpid ProtonJ2

In the same product, most dangerous first.

CVE-2026-67590HIGHApache Qpid ProtonJ2: Unbounded type nesting can lead to pre-authentication stackoverflowEPSS 0.8%CVE-2026-67589HIGHApache Qpid ProtonJ2: Type size/count handling can lead to excessive allocation pre-authenticationEPSS 0.8%CVE-2026-67588HIGHApache Qpid ProtonJ2: Unbounded symbol value caching can lead to pre-authentication resource exhaustionEPSS 0.8%CVE-2026-67592HIGHApache Qpid ProtonJ2: Unable to govern the maximum number of transfer frames per incoming deliveryEPSS 0.7%