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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-66273] Denial of Service due to excessive allocation

This high-severity Red Hat Linux advisory covers CVE-2026-66273 affecting Red Hat AMQ Broker 7.13.6, Red Hat AMQ Broker 7.14.1, Red Hat AMQ Clients.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-66273 Source published Source updated

VulniPulse record published Record updated

CVE-2026-66273
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

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 Proton-J: through 0.34.1.

Users are recommended to upgrade to version 0.35.0, which fixes the issue. A remote attacker, without needing to authenticate, could exploit a vulnerability in how the software handles type sizes and counts.

This could lead to excessive memory allocation, causing the system to become unresponsive and resulting in a denial of service. By sending specially crafted messages, an attacker can trigger excessive memory allocation, leading to resource exhaustion in applications utilizing the library within Red Hat products such as AMQ, Quarkus, Camel, and EAP.

Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770.

Affected Red Hat products: Red Hat AMQ Broker 7.13.6; Red Hat AMQ Broker 7.14.1; Red Hat AMQ Clients; Red Hat build of Apache Camel 4 for Quarkus 3; Red Hat build of Apache Camel for Spring Boot 4; Red Hat JBoss Enterprise Application Platform Expansion Pack. Red Hat fixing advisory: RHSA-2026:66545, RHSA-2026:66488.

Affected versions
  • 0.34.1

Official advisory · high-confidence parse· fetched 19 days ago·verify at source

Fixed versions
  • 0.35.0
  • proton-j
  • RHSA-2026:66545
  • RHSA-2026:66488

Official advisory · high-confidence parse· fetched 19 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Official advisory · high-confidence parse· fetched 19 days ago·verify at source

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