CVE catalog

CVE-2026-50734

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 craf

[CVE catalog]

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Jun 29, 2026, 10:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.74% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	activemq	sid	`5.17.6+dfsg-2`	vulnerable
Debian	activemq	trixie	`5.17.6+dfsg-2`	vulnerable
Debian	activemq	bookworm	`5.17.2+dfsg-2+deb12u1`	vulnerable
Debian	activemq	bookworm-security	`5.17.2+dfsg-2+deb12u1`	vulnerable
Cpe	activemq	Not reported	Not reported	vulnerable
Cpe	activemq	Not reported	`5.19.8`	fixed
Cpe	activemq	Not reported	`6.2.7`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	activemq	source	sid	`(unfixed)`	not yet assigned	Not reported	[1141385]
Debian	activemq	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1141385]
Debian	activemq	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1141385]
Cpe	activemq	cpe	Not reported	`5.19.8`	Not reported	Not reported	Not reported
Cpe	activemq	cpe	Not reported	`6.2.7`	Not reported	Not reported	Not reported

[Debian bug #1141385]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[activemq]Affected
Details (4)
- 5.17.2+dfsg-2+deb12u1 · all · bookworm
  Affected
  nvd · activemq · debian · bookworm; nvd · activemq · debian · 12
- 5.17.2+dfsg-2+deb12u1 · all · bookworm
  Affected
  nvd · activemq · debian · bookworm; nvd · activemq · debian · 12
- 5.17.2+dfsg-2+deb12u1 · all · bookworm-security
  Affected
  nvd · activemq · debian · bookworm; nvd · activemq · debian · 12
- 5.17.2+dfsg-2+deb12u1 · all · bookworm-security
  Affected
  nvd · activemq · debian · bookworm; nvd · activemq · debian · 12
[libactivemq-java]Affected
Source package: [activemq]
Details (4)
- 5.17.2+dfsg-2+deb12u1 · all · bookworm
  Affected
  nvd · activemq · debian · bookworm; nvd · activemq · debian · 12
- 5.17.2+dfsg-2+deb12u1 · all · bookworm
  Affected
  nvd · activemq · debian · bookworm; nvd · activemq · debian · 12
- 5.17.2+dfsg-2+deb12u1 · all · bookworm-security
  Affected
  nvd · activemq · debian · bookworm; nvd · activemq · debian · 12
- 5.17.2+dfsg-2+deb12u1 · all · bookworm-security
  Affected
  nvd · activemq · debian · bookworm; nvd · activemq · debian · 12

[Debian 13 (Trixie)]

[activemq]Affected
Details (2)
- 5.17.6+dfsg-2 · all · trixie
  Affected
  nvd · activemq · debian · 13
- 5.17.6+dfsg-2 · all · trixie
  Affected
  nvd · activemq · debian · 13
[libactivemq-java]Affected
Source package: [activemq]
Details (2)
- 5.17.6+dfsg-2 · all · trixie
  Affected
  nvd · activemq · debian · 13
- 5.17.6+dfsg-2 · all · trixie
  Affected
  nvd · activemq · debian · 13

Observed: Oct 23, 2026, 9:45:20 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]