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
CVE-2026-50734 is a CWE-789 vulnerability in Apache ActiveMQ Client and Apache ActiveMQ where an unauthenticated attacker can send a malicious WireFormatInfo frame containing an excessively large size value. This value is not validated properly, causing the broker to allocate excessive memory during pre-authentication negotiation, leading to an out-of-memory condition and broker crash (denial of service). The vulnerability affects Apache ActiveMQ Client and Apache ActiveMQ versions before 5.19.8 and from 6.0.0 before 6.2.7. The issue is fixed in versions 5.19.8 and 6.2.7.
Potential Impact
An unauthenticated remote attacker can cause a denial of service by crashing the Apache ActiveMQ broker through memory exhaustion triggered by a crafted network frame. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Users should upgrade Apache ActiveMQ Client and Apache ActiveMQ to version 5.19.8 or 6.2.7 or later, where this vulnerability is fixed. Patch status is confirmed by the vendor advisory recommending these versions. No other mitigations are indicated.
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
CVE-2026-50734 is a CWE-789 vulnerability in Apache ActiveMQ Client and Apache ActiveMQ where an unauthenticated attacker can send a malicious WireFormatInfo frame containing an excessively large size value. This value is not validated properly, causing the broker to allocate excessive memory during pre-authentication negotiation, leading to an out-of-memory condition and broker crash (denial of service). The vulnerability affects Apache ActiveMQ Client and Apache ActiveMQ versions before 5.19.8 and from 6.0.0 before 6.2.7. The issue is fixed in versions 5.19.8 and 6.2.7.
Potential Impact
An unauthenticated remote attacker can cause a denial of service by crashing the Apache ActiveMQ broker through memory exhaustion triggered by a crafted network frame. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Users should upgrade Apache ActiveMQ Client and Apache ActiveMQ to version 5.19.8 or 6.2.7 or later, where this vulnerability is fixed. Patch status is confirmed by the vendor advisory recommending these versions. No other mitigations are indicated.
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: 07/18/2026, 12:55:55 UTC
Last updated: 08/10/2026, 12:41:11 UTC
Views: 64
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