Affects widely deployed Apache Artemis / ActiveMQ Artemis message brokers; allows credential capture and potential cluster takeover—high-impact on enterprise infrastructure.
CVE-2026-49364
Unauthenticated capture of cluster admin credentials during broker handshake
Is CVE-2026-49364 being exploited?
Not confirmed. CVE-2026-49364 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.38% probability of exploitation in the next 30 days.
How severe is CVE-2026-49364?
CVE-2026-49364 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-49364?
Yes. A fix has been recorded for CVE-2026-49364. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-49364 affect?
CVE-2026-49364 affects Apache Artemis 2.50.0 - 2.56.0, Apache ActiveMQ Artemis 1.0.0 - 2.44.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-49364?
Upgrade to 2.57.0 immediately; isolate and restrict broker network access until patched
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Network-adjacent unauthenticated attacker can capture cluster administrative credentials during initial handshake, enabling cluster takeover, privileged access, message interception or disruption.
Immediate action required
- affected>= 1.0.0 and <= 2.44.0
- affected>= 2.50.0 and <= 2.56.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.