CVE-2026-57967 Apache Software Foundation CVE debrief

Who should care

Defenders responsible for Apache Artemis and Apache ActiveMQ Artemis deployments should assess exposure and prioritize upgrading to version 2.57.0. Defenders should verify affected versions and upgrade to 2.57.0. Monitoring for potential session hijacking attempts is necessary. The vulnerability affects Apache Artemis and Apache ActiveMQ Artemis, allowing unauthenticated remote attackers to steal existing sessions and assume ongoing execution of previously

Why it matters

CVE-2026-57967 is a critical vulnerability in Apache Artemis and Apache ActiveMQ Artemis that allows unauthenticated remote attackers to steal existing sessions and assume ongoing execution of previously authenticated sessions. Defenders should prioritize upgrading to version 2.57.0 and monitor for potential session hijacking attempts.

• Session hijacking is possible without authentication
• Ongoing execution of previously authenticated sessions can be assumed
• Defenders should verify affected versions and upgrade to 2.57.0
• Monitoring for potential session hijacking attempts is necessary

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 2.50.0 through 2.56.0; Apache ActiveMQ Artemis: from 1.0.0 through 2.44.0. The vulnerability has a CVSS score of 9.8 and a severity of CRITICAL. Users are recommended to upgrade to version 2.57.0, which fixes the issue. The vulnerability allows session hijacking without authentication, and defenders should prioritize upgrading to version 2.57.0.

Defensive priority

Defenders should prioritize upgrading to version 2.57.0 to fix the issue.

Recommended defensive actions

• Upgrade to version 2.57.0
• Review and update affected versions
• Monitor for potential session hijacking attempts
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability, including its description, affected versions, and recommended actions. The vulnerability has a CVSS score of 9.8 and a severity of CRITICAL. Users are recommended to upgrade to version 2.57.0, which fixes the issue. The CVE record was published on 2026-09-10T05:17:01.443Z and has not been modified since then. The NVD vulnerability detail page provides additional information on the vulnerability, including its description, affected versions, and

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.