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Vulnerability record · CVE-2026-67551 · published 5 August 2026

CVE-2026-67551: Apache qpid proton-dotnet vulnerability

Apache · Qpid Proton Dotnet

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.

7.5 CVSS 3.1 High EPSS 0.77% · top 46.0% CWE-789 · CWE-789
7.5CVSS 3.1 base score
0.77%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
7 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread/o566fhkrr3gg0lyzt24xwvz9w94oo6ro Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/08/04/22 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2026-67552Apache qpid proton-dotnet vulnerabilityA pre-authentication attacker could leverage type nesting to cause a StackOverflowError potentially leading to denial of service. This issue affects …EPSS 0.77%7.5CVE-2026-67465Apache qpid proton-dotnet allocation without limits vulnerabilityA pre-authentication attacker could leverage unbounded symbol value caching to cause resource exhaustion leading to denial of service. This issue aff…EPSS 0.77%6.5CVE-2026-67553Apache qpid proton-dotnet allocation without limits vulnerabilityAn authenticated attacker could exceed the session flow control incoming window potentially leading to denial of service. This issue affects Apache Q…EPSS 0.65%6.5CVE-2026-67554Apache qpid proton-dotnet vulnerabilityAn authenticated attacker can craft a disposition frame with large or illegal ranges causing excessive CPU usage due to naive range handling, leading…EPSS 0.65%6.5CVE-2026-67555Apache qpid proton-dotnet allocation without limits vulnerabilityIt was not possible to govern the maximum number of transfer frames per incoming delivery, enabling an authenticated attacker to cause excessive reso…EPSS 0.65%

Source: NIST National Vulnerability Database (record CVE-2026-67551), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.