What’s Vulnerable › Vulnerabilities

CVE-2026-66276: Apache Qpid Proton-J: Unbounded disposition range handling can lead to denial of service

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-05 · updated 2026-10-24
• Weakness: CWE-606

Description

An authenticated attacker can craft a disposition frame with large or illegal ranges causing excessive CPU usage due to naive range handling, leading to denial of service. This issue affects Apache Qpid Proton-J: through 0.34.1. Users are recommended to upgrade to version 0.35.0, which fixes the issue.

Affected products

• Apache Software Foundation Apache Qpid Proton-J: before 0.35.0 — fixed in 0.35.0

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Qpid Proton-J 0.35.0. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/14nj0lpsqpnd3q0hw0t0tw44qvdo1jc2
• http://www.openwall.com/lists/oss-security/2026/08/04/12

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