CVE-2026-67554 Apache Qpid Proton Dotnet: Unbounded disposition range handling can lead to denial of service

Medium 6.5 Published 5 Aug 2026 Updated 5 Aug 2026

An authenticated attacker can cause denial of service in Apache Qpid Proton Dotnet by sending crafted disposition frames with large ranges.

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-2026-67554?

CVE-2026-67554 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

An authenticated attacker can craft a disposition frame with large or illegal ranges causing excessive CPU usage due to naive range handling, leading to 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-606

Which versions are affected by CVE-2026-67554?

It affects 1 product.

Products include Apache Qpid Proton-Dotnet.

How do I fix CVE-2026-67554?

No fix has been published for CVE-2026-67554 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-2026-67554 being exploited?

There is no known exploitation of CVE-2026-67554 in the wild and no public exploit code.

Sources

Also known as GHSA-rvfm-5258-v4xj.