CVE-2026-67592 Apache Qpid ProtonJ2: Unable to govern the maximum number of transfer frames per incoming delivery

What is CVE-2026-67592?

CVE-2026-67592 is a high-severity denial of service vulnerability in Apache Qpid ProtonJ2, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

It was not possible to govern the maximum number of transfer frames per incoming delivery, enabling an authenticated attacker to cause excessive resource usage and potential 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

Weakness: CWE-770

Which versions are affected by CVE-2026-67592?

It affects 1 product.

Products include Apache Qpid Protonj2.

How do I fix CVE-2026-67592?

No fix has been published for CVE-2026-67592 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-67592 being exploited?

There is no known exploitation of CVE-2026-67592 in the wild and no public exploit code.

Other vulnerabilities in Apache Qpid ProtonJ2

• CVE-2026-67588 Apache Qpid ProtonJ2: Unbounded symbol value caching can lead to pre-authentication resource exhaustion High 7.5
• CVE-2026-67589 Apache Qpid ProtonJ2: Type size/count handling can lead to excessive allocation pre-authentication High 7.5
• CVE-2026-67590 Apache Qpid ProtonJ2: Unbounded type nesting can lead to pre-authentication stackoverflow High 7.5
• CVE-2026-67591 Apache Qpid ProtonJ2: Incoming session flow control window can be exceeded Medium 6.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-4gqp-3m3h-rrx3, UBUNTU-CVE-2026-67592.