Memory Allocation Vulnerability in Apache ActiveMQ Products
CVE-2026-50734

7.5HIGH

Key Information:

Vendor

Apache
Status
Apache ActiveMQ Client
Apache ActiveMQ
Apache ActiveMQ All
Vendor
CVE Published:
30 June 2026

What is CVE-2026-50734?

A memory allocation vulnerability exists in Apache ActiveMQ products due to improper validation of size values in the WireFormatInfo frame. An unauthenticated attacker can exploit this vulnerability by sending a crafted frame, leading to a denial of service condition. This results in the broker attempting excessive memory allocation during the pre-authentication negotiation process, potentially causing an out-of-memory (OOM) condition and subsequent crash. Users are advised to upgrade to versions 6.2.7 or 5.19.8 to mitigate this risk.

Affected Version(s)

Apache ActiveMQ 0 < 5.19.8

Apache ActiveMQ 6.0.0 < 6.2.7

Apache ActiveMQ All 0 < 5.19.8

References

https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4y...
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Andrej Tomci
.