Apache ActiveMQ/ActiveMQ MQTT up to 6.2.3 MQTT Control Packet length privilege escalation

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
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CTI Interest Score
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6.0$0-$5k0.27

Summaryinfo

A vulnerability was found in Apache ActiveMQ and ActiveMQ MQTT up to 6.2.3. It has been declared as critical. This issue affects some unknown processing of the component MQTT Control Packet Handler. Such manipulation of the argument length leads to an unknown weakness. This vulnerability is listed as CVE-2026-40046. The attack may be performed from remote. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Apache ActiveMQ and ActiveMQ MQTT up to 6.2.3 and classified as critical. Affected by this issue is some unknown processing of the component MQTT Control Packet Handler. The manipulation of the argument length with an unknown input leads to a unknown weakness. The impact remains unknown.

The advisory is available at lists.apache.org. This vulnerability is handled as CVE-2026-40046. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/09/2026).

Upgrading to version 6.2.4 eliminates this vulnerability.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Privilege escalation
CWE: Unknown
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: ActiveMQ/ActiveMQ MQTT 6.2.4

Timelineinfo

04/09/2026 Advisory disclosed
04/09/2026 +0 days VulDB entry created
04/09/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: apache.org

Advisory: lists.apache.org
Status: Confirmed

CVE: CVE-2026-40046 (🔒)
GCVE (CVE): GCVE-0-2026-40046
GCVE (VulDB): GCVE-100-356558

Entryinfo

Created: 04/09/2026 15:12
Changes: 04/09/2026 15:12 (52)
Complete: 🔍
Cache ID: 216:C49:103

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