CVE-2026-507347.5HighCWE-789

CVE-2026-50734: Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All: Pre-authentication OpenWire memory-allocation DoS during wire format negotiation

Apache Software Foundation · Apache ActiveMQ Client

Vendor fix available · Affected: Apache Software Foundation Apache ActiveMQ Client · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.7%probability of exploitation in the next 30 days

55th percentile

050100

Higher than 55% of scored CVEs

7.5HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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.

Affected products3

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Apache Software Foundation · Apache ActiveMQ Clientbefore 5.19.8; from 6.0.0 before 6.2.7
Apache Software Foundation · Apache ActiveMQbefore 5.19.8; from 6.0.0 before 6.2.7
Apache Software Foundation · Apache ActiveMQ Allbefore 5.19.8; from 6.0.0 before 6.2.7

On the Atlas

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Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Memory Allocation with Excessive Size Value · Denial of Service
Vendor: Apache Software Foundation
Published: June 2026
Band: Unlikely (under 1%), June 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-50734 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.