CVE-2026-57967 Apache Software Foundation CVE debrief

Who should care

Defenders and administrators of Apache Artemis and Apache ActiveMQ Artemis deployments should assess exposure and prioritize upgrading to version 2.57.0. They should also verify session reattachment authentication and monitor for suspicious activity. Additionally, security teams and vulnerability management teams should review the issue and plan for remediation.

Why it matters

Apache Artemis and Apache ActiveMQ Artemis are vulnerable to missing authentication on CORE protocol session reattachment, allowing an unauthenticated remote attacker to steal an existing session and assume ongoing execution of the previously authenticated session. Defenders and administrators should assess exposure, prioritize upgrading to version 2.57.0, verify session reattachment authentication, and monitor for suspicious activity.

• Potential session hijacking and unauthorized access
• Possible disruption of ongoing operations
• Need for verification of session reattachment authentication
• Priority for upgrading to version 2.57.0

Technical summary

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 version 2.50.0 through 2.56.0 and Apache ActiveMQ Artemis from version 1.0.0 through 2.44.0. The vulnerability is caused by a missing authentication mechanism in the CORE protocol session reattachment process. Users are recommended to upgrade to version 2.57.0, which fixes the issue. Defenders should verify session reattachment authentication and monitor for suspicious activity.

Defensive priority

High priority for upgrading to version 2.57.0, verifying session reattachment authentication, and monitoring for suspicious activity

Recommended defensive actions

• Upgrade to version 2.57.0
• Verify session reattachment authentication
• Monitor for suspicious activity
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets
• Track exceptions and retest remediated assets
• Confirm whether affected product deployments exist in managed environments

Evidence notes

The CVE record and source item provide details on the vulnerability, affected versions, and recommended upgrade to version 2.57.0. The vulnerability is caused by a missing authentication mechanism in the CORE protocol session reattachment process. This issue has been publicly disclosed and defenders should assess their exposure and prioritize upgrading to the fixed version. The CVE record was published on 2026-09-10T04:43:10.313Z and has not been modified since then.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.