Bug 2494842 (CVE-2026-53917)

Summary:	CVE-2026-53917 activemq: activemq-all: activemq-client: activemq-broker: Apache ActiveMQ: Denial of Service via crafted OpenWire Message
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	anthomas, anujha, aschwart, asoldano, aszczucz, ataylor, bbaranow, bmaxwell, boliveir, bstansbe, dbruscin, dlofthou, drichtar, ehelms, ehugonne, fmariani, ggainey, gmalinko, gtanzill, istudens, ivassile, iweiss, janstey, jbuscemi, jpasqual, juwatts, jwon, kvanderr, mcarlett, mhulan, mosmerov, mposolda, msvehla, nmoumoul, nwallace, osousa, pcreech, pdelbell, pesilva, pjindal, pmackay, rchan, rhel-process-autobot, rmartinc, rstancel, rstepani, smallamp, ssilvert, sthorger, tcunning, thjenkin, tmalecek, vdosoudi, vmuzikar, watson-tool-maintainers, yfang
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in Apache ActiveMQ. An authenticated user can exploit this vulnerability by sending a specially crafted OpenWire Message with an excessively large encoded size value for the message property map. This lack of size validation during unmarshaling can lead to an out-of-memory error, causing the broker to crash and resulting in a Denial of Service (DoS).	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2495077, 2495078
Bug Blocks:

Description OSIDB Bzimport 2026-06-30 11:02:08 UTC

Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Client, Apache ActiveMQ Broker.

An authenticated user can cause a broker DoS by sending a crafted OpenWire Message with a large encoded size value for the map. OpenWire message property maps are unmarshaled without size validation which can trigger OOM and crash the broker.
This issue affects 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; Apache ActiveMQ Client: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ Broker: 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.