What’s Vulnerable › Vulnerabilities

CVE-2026-57967: Apache Artemis, Apache ActiveMQ Artemis: Missing authentication on CORE protocol session reattachment

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-10 · updated 2026-10-09
• Weakness: CWE-306

Description

An unauthenticated remote attacker can craft a CORE protocol SESSION_REATTACH packet to steal an existing session and assume ongoing execution of the previously authenticated session. This issue affects Apache Artemis: from 2.50.0 through 2.56.0; Apache ActiveMQ Artemis: from 1.0.0 through 2.44.0. Users are recommended to upgrade to version 2.57.0, which fixes the issue.

Affected products

• Apache Software Foundation Apache ActiveMQ Artemis: from 1.0.0 before 2.44.0; from 2.50.0 before 2.57.0 — fixed in 2.44.0, 2.57.0

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache ActiveMQ Artemis 2.44.0, 2.57.0. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/fxfjqrdsnksw5f17zs3yqo864lblgv6y
• http://www.openwall.com/lists/oss-security/2026/09/10/5
• https://github.com/c0dem4sters/CVE-2026-57967

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