CVE-2026-67555 Apache Qpid Proton Dotnet: Unable to govern the maximum number of transfer frames per incoming delivery

Medium 6.5 Published 5 Aug 2026 Updated 5 Aug 2026

An authenticated attacker can cause excessive resource usage and denial of service by sending uncontrolled transfer frames in Apache Qpid Proton Dotnet.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-67555?

CVE-2026-67555 is a medium-severity denial of service vulnerability in Apache Qpid Proton Dotnet, published on 5 Aug 2026. Any signed-in user can exploit it over the network, 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 Proton-Dotnet: through 1.0.0.

Users are recommended to upgrade to version 1.1.0, which fixes the issue.

Weakness: CWE-770

Which versions are affected by CVE-2026-67555?

It affects 1 product.

Products include Apache Qpid Proton-Dotnet.

How do I fix CVE-2026-67555?

No fix has been published for CVE-2026-67555 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-2026-67555 being exploited?

There is no known exploitation of CVE-2026-67555 in the wild and no public exploit code.

Sources

Also known as GHSA-4cqm-fq4g-r4vq.