CVE-2026-67589
CVE-2026-67589 is a high-severity vulnerability in Apache Qpid Protonj2 with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-789.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- EPSS exploit prediction: 0% (40th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-789
- Affected product: Apache Qpid Protonj2
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-67589?
- 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.
- How severe is CVE-2026-67589?
- CVE-2026-67589 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2026-67589 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-67589?
- CVE-2026-67589 affects Apache Qpid Protonj2. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-67589?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2026-67589 published?
- CVE-2026-67589 was published on 2026-08-05 and last updated on 2026-08-07.
References
- https://lists.apache.org/thread/bs24x4778dh72xtfs299cy8krvdlo47q
- http://www.openwall.com/lists/oss-security/2026/08/04/28
Affected products (1)
- cpe:2.3:a:apache:qpid_protonj2:*:*:*:*:*:*:*:*
More vulnerabilities in Apache Qpid Protonj2
- CVE-2026-67592 — High (CVSS 7.5): It was not possible to govern the maximum number of transfer frames per incoming delivery, enabling an authenticated…
- CVE-2026-67590 — High (CVSS 7.5): A pre-authentication attacker could leverage type nesting to cause a StackOverflowError potentially leading to denial…
- CVE-2026-67588 — High (CVSS 7.5): A pre-authentication attacker could leverage unbounded symbol value caching to cause resource exhaustion leading to…
- CVE-2026-67591 — Medium (CVSS 6.5): An authenticated attacker could exceed the session flow control incoming window potentially leading to denial of…
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