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CVE-2026-50734 Apache ActiveMQ

Affected softwareApache ActiveMQ
Severity7.5 High CVSS 3.1
Fixed in5.19.8, 6.2.7
WeaknessCWE-789
Published30 Jun 2026
Updated2 Jul 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.74% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: apache/activemq #2080.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Security Patch Update September 2026 ↗ CSPU 2026-Q3 Oracle Communications / Message Bus (Apache ActiveMQ) (6.1.1-7.0.0)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications Message Bus (Apache ActiveMQ) 6.1.1-7.0.0

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.activemq:activemq-client 0 5.19.8 unbounded
org.apache.activemq:activemq-client 6.0.0 6.2.7 unbounded
org.apache.activemq:apache-activemq 0 5.19.8 unbounded
org.apache.activemq:apache-activemq 6.0.0 6.2.7 unbounded
org.apache.activemq:activemq-all 0 5.19.8 unbounded
org.apache.activemq:activemq-all 6.0.0 6.2.7 unbounded

Products and versions

4 products, 8 version entries
SourceVendorProductSchemeAffected versions
nvd apache activemq generic < 5.19.8 · ≥ 6.0.0 and < 6.2.7
osv org.apache.activemq activemq-all generic < 5.19.8 · ≥ 6.0.0 and < 6.2.7
osv org.apache.activemq activemq-client generic < 5.19.8 · ≥ 6.0.0 and < 6.2.7
osv org.apache.activemq apache-activemq generic < 5.19.8 · ≥ 6.0.0 and < 6.2.7

References

URLTags
https://github.com/apache/activemq/pull/2080 WEB
https://github.com/apache/activemq/commit/42e2be75eddcece3cddacf8a73e6cad7db5aa626 WEB
https://github.com/apache/activemq/commit/6fc46e520bac7d9763ba5762cc2de603f19ed517 WEB
https://github.com/apache/activemq/commit/e25f9b88898ef7cdfac9e855f4559a1ad0a6da12 WEB
https://github.com/apache/activemq PACKAGE
https://github.com/apache/activemq/releases/tag/activemq-5.19.8 WEB
https://github.com/apache/activemq/releases/tag/activemq-6.2.7 WEB
https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4yf931xk0 WEB
http://www.openwall.com/lists/oss-security/2026/06/29/10 WEB

Timeline

Published2026-06-30By the CVE Program.
NVD record modified2026-07-02NVD's own last-modified date for this record.