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VulnerabilityPublished Updated

CVE-2026-108946: Apache ActiveMQ, Apache ActiveMQ KahaDB · Improper Input Validation Vulnerability

Affects activemqSource GCVE Database

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Authoritative record:CVE-2026-108946· Medium 6.5

Not known to be exploited · CVSS 6.5 Medium · fixed in 6.4.0 : update activemq when convenient.

Data as of 13 Nov 2026, 22:04 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CISA-ADPCVSS 3.16.5
Patch
Available – fixed in 6.4.0
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 26.10activemqpkg:deb/ubuntu/activemq?arch=source&distro=stonkingOther threatsAffected
  • =5.17.6+dfsg-2
  • =5.17.6+dfsg-2ubuntu1
Fixed in–
Ubuntu 26.04 LTSactivemqpkg:deb/ubuntu/activemq?arch=source&distro=resoluteOther threatsAffected
  • =5.17.6+dfsg-2
Fixed in–
Ubuntu 24.04 LTSactivemqpkg:deb/ubuntu/activemq?arch=source&distro=nobleOther threatsAffected
  • =5.17.2+dfsg-2
  • =5.17.6+dfsg-1
Fixed in–
Ubuntu Pro 22.04 LTSactivemqpkg:deb/ubuntu/activemq?arch=source&distro=esm-apps/jammyOther threatsAffected
  • =5.16.1-1
  • =5.16.1-1ubuntu0.1~esm1
  • =5.16.1-1ubuntu0.1
Fixed in–
Ubuntu Pro 20.04 LTSactivemqpkg:deb/ubuntu/activemq?arch=source&distro=esm-apps/focalOther threatsAffected
  • =5.15.10-1
  • =5.15.11-1
  • =5.15.11-1ubuntu0.1~esm1
Fixed in–
Ubuntu Pro 18.04 LTSactivemqpkg:deb/ubuntu/activemq?arch=source&distro=esm-apps/bionicOther threatsAffected
  • 5.14.5-3 – 5.15.8-2~18.04.1~esm1
5 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

Improper input validation vulnerability in Apache ActiveMQ, Apache ActiveMQ KahaDB. The ActiveMQ broker resolves connection, session and consumer state from ids that are user provided and in some scenarios does not validate that they ids are bound to that user. This allows an authenticated client to spoof another user's ids. This allows: *  an authenticated client consumes from another connection's temporary queue/topic by putting the victim's connection id in its own ConsumerId, bypassing the broker-side ownership check. * a duplicate ConsumerId registration is only logged, after which the attacker's RemoveInfo or disconnect tears down the victim's live subscription * a forged MessageAck for the victim's ConsumerId permanently deletes an in-flight, unacknowledged message. This issue affects Apache ActiveMQ: from 6.0.0 before 6.3.3, before 5.19.12; Apache ActiveMQ KahaDB: from 6.0.0 before 6.3.3, before 5.19.12. Users are recommended to upgrade to version 6.4.0, 6.3.3, or 5.19.12, which fixes the issue.

References

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