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Apache CXF EUVDEUVD-2026-53854

| CVE-2026-66909 CRITICAL
Deserialization of Untrusted Data (CWE-502)
2026-08-06 apache GHSA-gvw8-rcrx-9fxx
9.8
CVSS 3.1 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
9.8 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.5 HIGH

Network vector via JMS broker; AC:H because RCE requires a gadget chain on classpath; PR:L because JMS destination access typically requires some broker-level credential.

3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Red Hat
8.1 HIGH
qualitative

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Patch available
Aug 06, 2026 - 12:01 EUVD
Analysis Generated
Aug 06, 2026 - 11:36 vuln.today
CVE Published
Aug 06, 2026 - 10:23 cve.org
HIGH

DescriptionCVE.org

Apache CXF's JMS transport deserializes the body of any inbound JMS ObjectMessage using native Java deserialization, with no type restrictions in place. Any attacker able to place a message on the service's JMS destination can submit a malicious serialized object, leading to denial of service or, if a suitable gadget class is on the classpath, remote code execution. The fix disables ObjectMessage deserialization by default, with a configuration switch to re-enable it if needed. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue.

AnalysisAI

Unsafe deserialization in Apache CXF's JMS transport allows any party able to publish to the service's JMS destination to achieve denial of service or, where a compatible deserialization gadget chain is present on the application classpath, remote code execution within the CXF process. All Apache CXF versions prior to 4.2.3, 4.1.8, and 3.6.12 are affected when the JMS transport is in use. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Gain write access to JMS broker destination
Delivery
Craft malicious serialized Java object payload
Exploit
Publish ObjectMessage to CXF service queue
Execution
CXF JMS transport calls ObjectInputStream.readObject() with no type filter
Persist
Gadget chain triggers arbitrary OS command execution
Impact
Achieve RCE as JVM process user

Vulnerability AssessmentAI

Exploitation Exploitation requires two concrete conditions: (1) the target Apache CXF deployment must be configured to use the JMS transport - services operating solely via HTTP/REST transports are not affected; and (2) the attacker must be able to place a message on the service's JMS destination, which requires network-level access to the JMS broker and sufficient broker-level permissions (which vary by broker configuration - some environments expose queues without authentication, others require credentials). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Real-world risk is elevated for any deployment using Apache CXF's JMS transport, but is tempered by two conditional requirements: access to the JMS destination and the presence of an exploitable gadget chain on the classpath. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with access to the JMS broker - whether through a compromised internal service, exposed broker port, or misconfigured ACL - publishes a crafted JMS ObjectMessage containing a malicious serialized Java object to the CXF service's queue. When CXF's JMS transport dequeues the message, it calls ObjectInputStream.readObject() without type restriction, triggering the deserialization of the payload. …
Remediation The primary remediation is to upgrade Apache CXF to version 4.2.3, 4.1.8, or 3.6.12, which disable ObjectMessage deserialization by default; the fix introduces a configuration switch to re-enable it only if operationally required. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all systems running Apache CXF versions 3.6.11, 4.1.7, or 4.2.2 and earlier with JMS transport enabled; document which have deserialization gadget libraries (commons-collections, ROME) on the classpath. …

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EUVD-2026-53854 vulnerability details – vuln.today

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