Apache Qpid PROTONJ2 vulnerabilities

5 CVEs affecting Apache Qpid PROTONJ2, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-67592, published 2026-08-05.

Highest priority

Known exploited (CISA KEV) first, then by EPSS exploit probability.

CVE-2026-67590, published 2026-08-05. High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days. A pre-authentication attacker could leverage type nesting to cause a StackOverflowError potentially leading to denial of service. This issue affects Apache Qpid ProtonJ2: through 1.1.0. Users are…
CVE-2026-67589, published 2026-08-05. High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days. 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…
CVE-2026-67588, published 2026-08-05. High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days. A pre-authentication attacker could leverage unbounded symbol value caching to cause resource exhaustion leading to denial of service. This issue affects Apache Qpid ProtonJ2: through 1.1.0. Users…
CVE-2026-67592, published 2026-08-05. High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days. 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…
CVE-2026-67591, published 2026-08-05. Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days. An authenticated attacker could exceed the session flow control incoming window potentially leading to denial of service. This issue affects Apache Qpid ProtonJ2: through 1.1.0. Users are…