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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-66257] Denial of Service via unbounded symbol value caching

This high-severity Red Hat Linux advisory covers CVE-2026-66257 affecting Red Hat AMQ Broker 7.13.6, Red Hat AMQ Broker 7.14.1, Red Hat AMQ Clients.

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CVE-2026-66257 Source published Source updated

VulniPulse record published Record updated

CVE-2026-66257
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

A pre-authentication attacker could leverage unbounded symbol value caching to cause resource exhaustion 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. A remote attacker, without needing to authenticate, could exploit an issue with unbounded symbol value caching.

This could lead to resource exhaustion, where the system runs out of available resources, ultimately causing a denial of service (DoS). A denial of service attack makes the affected system unavailable to legitimate users.

This can lead to service unavailability in Red Hat products utilizing affected versions of Proton-J that expose a network endpoint. The vulnerability's impact is significant due to the potential for unauthenticated remote attackers to disrupt service.

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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