CVE-2026-50734: CWE-789 Memory Allocation with Excessive Size Value in Apache Software Foundation Apache ActiveMQ Client
Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All. An unauthenticated network attacker can cause a broker DoS by sending a crafted WireFormatInfo frame with a malicious large size value. The value is not validate and causes the broker to attempt allocation during pre-auth negotiation which can trigger OOM and crash the broker. This issue affects Apache ActiveMQ Client: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ All: before 5.19.8, from 6.0.0 before 6.2.7. Users are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-50734) in Apache ActiveMQ Client and Apache ActiveMQ involves improper validation of a size value in the WireFormatInfo frame. An unauthenticated attacker can exploit this by sending a maliciously large size value, causing the broker to attempt excessive memory allocation during the pre-authentication phase. This can lead to an out-of-memory condition and crash the broker, resulting in a denial of service. The affected versions include all releases before 5.19.8 and from 6.0.0 up to but not including 6.2.7. The vendor recommends upgrading to 5.19.8 or 6.2.7 to fix the issue.
Potential Impact
An unauthenticated network attacker can cause a denial of service by crashing the broker through excessive memory allocation triggered by a crafted WireFormatInfo frame. This disrupts broker availability but does not indicate code execution or data compromise.
Mitigation Recommendations
Users should upgrade Apache ActiveMQ Client and Apache ActiveMQ to versions 5.19.8 or 6.2.7 or later, which contain fixes for this vulnerability. Patch status is confirmed by the vendor advisory recommending these versions. No other mitigations are specified.
CVE-2026-50734: CWE-789 Memory Allocation with Excessive Size Value in Apache Software Foundation Apache ActiveMQ Client
Description
Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All. An unauthenticated network attacker can cause a broker DoS by sending a crafted WireFormatInfo frame with a malicious large size value. The value is not validate and causes the broker to attempt allocation during pre-auth negotiation which can trigger OOM and crash the broker. This issue affects Apache ActiveMQ Client: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ All: before 5.19.8, from 6.0.0 before 6.2.7. Users are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue.
CVSS v3.1
Score 7.5high
Affected software
pkg:maven/Apache Software Foundation/org.apache.activemq:activemq-clientRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-50734) in Apache ActiveMQ Client and Apache ActiveMQ involves improper validation of a size value in the WireFormatInfo frame. An unauthenticated attacker can exploit this by sending a maliciously large size value, causing the broker to attempt excessive memory allocation during the pre-authentication phase. This can lead to an out-of-memory condition and crash the broker, resulting in a denial of service. The affected versions include all releases before 5.19.8 and from 6.0.0 up to but not including 6.2.7. The vendor recommends upgrading to 5.19.8 or 6.2.7 to fix the issue.
Potential Impact
An unauthenticated network attacker can cause a denial of service by crashing the broker through excessive memory allocation triggered by a crafted WireFormatInfo frame. This disrupts broker availability but does not indicate code execution or data compromise.
Mitigation Recommendations
Users should upgrade Apache ActiveMQ Client and Apache ActiveMQ to versions 5.19.8 or 6.2.7 or later, which contain fixes for this vulnerability. Patch status is confirmed by the vendor advisory recommending these versions. No other mitigations are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-06-05T17:01:29.414Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a439fbb27e9c797199c07c7
Added to database: 06/30/2026, 10:51:39 UTC
Last enriched: 06/30/2026, 11:07:04 UTC
Last updated: 06/30/2026, 13:23:21 UTC
Views: 5
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