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Apache EUVD-2026-20956

| CVE-2026-40046 HIGH
Integer Overflow or Wraparound (CWE-190)
2026-04-09 apache GHSA-xvqc-pp94-fmpx
Buffer Overflow Apache Integer Overflow Red Hat
7.5
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

4
Patch released
Apr 10, 2026 - 20:30 nvd
Patch available
EUVD ID Assigned
Apr 09, 2026 - 16:30 euvd
EUVD-2026-20956
Analysis Generated
Apr 09, 2026 - 16:30 vuln.today
CVE Published
Apr 09, 2026 - 15:58 nvd
HIGH 7.5

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 6 maven packages depend on org.apache.activemq:activemq-all (3 direct, 3 indirect)
  • 6 maven packages depend on org.apache.activemq:activemq-mqtt (5 direct, 1 indirect)

Ecosystem-wide dependent count for version 6.0.0 and other introduced versions.

DescriptionNVD

Integer Overflow or Wraparound vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ MQTT.

The fix for "CVE-2025-66168: MQTT control packet remaining length field is not properly validated" was only applied to 5.19.2 (and future 5.19.x) releases but was missed for all 6.0.0+ versions.

This issue affects Apache ActiveMQ: from 6.0.0 before 6.2.4; Apache ActiveMQ All: from 6.0.0 before 6.2.4; Apache ActiveMQ MQTT: from 6.0.0 before 6.2.4.

Users are recommended to upgrade to version 6.2.4 or a 5.19.x version starting with 5.19.2 or later (currently latest is 5.19.5), which fixes the issue.

AnalysisAI

Remote denial-of-service in Apache ActiveMQ 6.0.0 through 6.2.3 allows unauthenticated network attackers to crash the MQTT broker via malformed control packets. An integer overflow in the MQTT protocol handler's remaining length field validation enables resource exhaustion without authentication. …

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RemediationAI

Within 24 hours: Identify all ActiveMQ instances running versions 6.0.0-6.2.3 via inventory scan and document MQTT broker exposure. Within 7 days: Implement network-level access controls to restrict MQTT protocol traffic (port 1883/8883) to trusted sources only, and monitor ActiveMQ logs for malformed packet attempts. …

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EUVD-2026-20956 vulnerability details – vuln.today
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