Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Client, Apache ActiveMQ Broker. (CVE-2026-53917)
Description
A vulnerability in Apache ActiveMQ allows an authenticated user to cause a denial of service (DoS) by sending a crafted OpenWire message with an excessively large encoded size value for the map. This triggers out-of-memory (OOM) conditions and crashes the broker. The issue affects multiple Apache ActiveMQ components before versions 5.19.8 and 6.2.7. Upgrading to these fixed versions mitigates the vulnerability.
CVSS v3.1
Score 7.5high
Affected software
pkg:deb/ubuntu/activemq?arch=source&distro=esm-apps/xenialpkg:deb/ubuntu/activemq?arch=source&distro=esm-apps/bionicpkg:deb/ubuntu/activemq?arch=source&distro=esm-apps/focalpkg:deb/ubuntu/activemq?arch=source&distro=esm-apps/jammypkg:deb/ubuntu/activemq?arch=source&distro=noblepkg:deb/ubuntu/activemq?arch=source&distro=questingpkg:deb/ubuntu/activemq?arch=source&distro=stonkingpkg:deb/ubuntu/activemq?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-53917 describes a memory allocation vulnerability in Apache ActiveMQ where OpenWire message property maps are unmarshaled without validating the size value. An authenticated attacker can exploit this by sending a crafted message with a large encoded size, causing the broker to allocate excessive memory, leading to out-of-memory conditions and a crash (denial of service). This affects Apache ActiveMQ versions before 5.19.8 and from 6.0.0 before 6.2.7 across multiple components including ActiveMQ All, Client, and Broker. The issue is resolved in versions 5.19.8 and 6.2.7.
Potential Impact
The vulnerability allows an authenticated user to cause a denial of service by crashing the Apache ActiveMQ broker through memory exhaustion. There is no indication of confidentiality or integrity impact. The primary impact is availability degradation due to broker crashes.
Mitigation Recommendations
Users should upgrade Apache ActiveMQ to version 5.19.8 or 6.2.7 or later, where this vulnerability is fixed. No other mitigations are indicated. Patch status is confirmed by the vendor advisory recommending these versions.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53917
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:25.10","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad3f5ff2cdf04f656663ff4
Added to database: 10/17/2026, 22:26:07 UTC
Last enriched: 10/18/2026, 00:50:13 UTC
Last updated: 10/18/2026, 00:50:13 UTC
Views: 2
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