CVE-2026-57967

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.

Score

CVSS 3.1 9.8 Critical

Status

Modified - security@apache.org

Published

2026-09-10

Last modified

2026-10-09

Weaknesses

CWE-306

Affected products

• Artemis (Apache)
• Apache Activemq Artemis (Apache Software Foundation)
• Apache Artemis (Apache Software Foundation)

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