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Critical· 9.1official fix available

CVE-2026-49364

A critical vulnerability (CVE-2026-49364) allows unauthenticated attackers to capture cluster administrative credentials during the initial connection handshake in Apache Artemis and Apache ActiveMQ Artemis. The issue affects versions 2.50.0–2.56.0 of Artemis and 1.0.0–2.44.0 of ActiveMQ Artemis, and is resolved by upgrading to version 2.57.0.

publishedSep 10, 2026
last modifiedSep 10, 2026
sourcesNVD
severity · cvss
9.1
critical · how bad it is
exploitation · epss
<1%
22th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Oct 10, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

Apache Artemis (versions 2.50.0 through 2.56.0) and Apache ActiveMQ Artemis (versions 1.0.0 through 2.44.0)

02

Real-world impact

An unauthenticated network-adjacent attacker can use discovery mechanisms to steal cluster administrative credentials during the first connection handshake, potentially leading to full compromise of the cluster.

03

Why this severity

Critical (CVSS base score: 9.1) due to high severity (C:H), high impact (I:H), and no privilege requirements (A:N).

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade Apache Artemis from version 2.50.0 through 2.56.0 to version 2.57.0 or later.
  2. 02Upgrade Apache ActiveMQ Artemis from version 1.0.0 through 2.44.0 to version 2.57.0 or later.

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. (NVD description)

05

Timeline

  1. Sep 10, 2026 · 4d ago
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Sep 10, 2026 · 3d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactNone
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →