Vulnerability · Published Aug 5, 2026 · Assigned by apache
CVE-2026-67551Apache Qpid Proton Dotnet: Type size/count handling can lead to excessive allocation pre-authentication
High 7.5
In plain English
A high-severity security flaw in Apache Qpid Proton Dotnet from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.8%top 44.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Qpid Proton Dotnet | 0 – through 1.0.0 |
Weakness: CWE-789 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H