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Vulnerability record · CVE-2026-67589 · published 5 August 2026

CVE-2026-67589: Apache qpid protonj2 vulnerability

Apache · Qpid Protonj2

A pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to 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.

7.5 CVSS 3.1 High EPSS 0.77% · top 46.1% 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

A pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to 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.

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/bs24x4778dh72xtfs299cy8krvdlo47q Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/08/04/28 Third Party Advisory

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Related vulnerabilities

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

7.5CVE-2026-67590Apache qpid protonj2 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-2026-67592Apache qpid protonj2 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 0.74%7.5CVE-2026-67588Apache qpid protonj2 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-2026-67591Apache qpid protonj2 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%

Source: NIST National Vulnerability Database (record CVE-2026-67589), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.