CVE-2026-67591
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% of all known CVEs
Summary
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.
Risk Assessment
An attacker can cause session overload, potentially leading to service unavailability.
Recommendation
It is recommended to upgrade to version 1.2.0, which fixes the issue.
Other vulnerabilities in Apache Qpid ProtonJ2
See all- CVE-2026-67592High
In Apache Qpid ProtonJ2 through 1.1.0, 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. Users are recommended to upgrade to version 1.2.0, which fixes the issue.
- CVE-2026-67590High
A pre-authentication attacker could leverage type nesting to cause a StackOverflowError potentially leading to denial of service. Affects Apache Qpid ProtonJ2 through 1.1.0.
- CVE-2026-67589High
A pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to potential denial of service. Affects Apache Qpid ProtonJ2 through 1.1.0.
- CVE-2026-67588High
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 are recommended to upgrade to version 1.2.0, which fixes the issue.
Original NVD description (English source)
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 recommended to upgrade to version 1.2.0, which fixes the issue.