Intel

CVE-2026-66909

cxf: Deserialization of Untrusted Data (CVE-2026-66909)

criticalEPSS 1.2%

Affected

  • apache/cxf lt *..3.6.12
  • apache/cxf between 4.0.0..4.1.8
  • apache/cxf between 4.2.0..4.2.3

Description

A flaw was found in Apache CXF. The Java Message Service (JMS) transport component improperly deserializes inbound JMS ObjectMessages without type restrictions. A remote attacker can exploit this by sending a specially crafted message to the service's JMS destination. This vulnerability could lead to a denial of service or, in certain configurations, enable remote code execution on the affected system.

Source: redhat_csafcvelistv5NVD (NIST)BSI WID PortalBSI CSAF

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

apachecxf
4.0.0 – 4.1.84.2.0 – 4.2.33.6.12fixed from 3.6.12

Metrics

XIEM Effective CVSS
9.8
Source: cna-v3
EPSS percentile
65.9 %
High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
—
Show all metrics
Severity
critical
Priority score
108.13
Exploit maturity
no public PoC known
CVSS v3
9.8
EPSS score
1.2 %
Moderate — model estimates 1-10% exploitation likelihood.
Published
2026-08-06 10:23 UTC
CWE
CWE-502

Weakness classes (CWE)

  • CWE-502Base

    Deserialization of Untrusted Data

    The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

    cwe.mitre.org →

References & sources

Reanalysis & status changes

Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

  1. CVE Modified2026-08-07 00:16 UTC· af854a3a-2127-422b-91ae-364da2661108
    • Reference: http://www.openwall.com/lists/oss-security/2026/08/06/18
  2. Initial Analysis2026-08-06 18:41 UTC· nvd@nist.gov
    • CPE Configuration: OR *cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:* versions up to (excluding) 3.6.12 *cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:* versions from (including) 4.0.0 up to (excluding) 4.1.8 *cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:* versions from (including) 4.2.0 up to (excluding) 4.2.3
    • Reference Type: Apache Software Foundation: https://lists.apache.org/thread/lr5d4tg6tf7j29jmw8wt242oowonjqpx Types: Mailing List, Vendor Advisory
  3. CVE Modified2026-08-06 16:16 UTC· 134c704f-9b21-4f2e-91b3-4a467353bcc0
    • CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    • SSVC: {"id":"CVE-2026-66909","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technical…
  4. New CVE Received2026-08-06 11:16 UTC· security@apache.org
    • Affected: Apache CXF
    • Description: 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.
    • CWE: CWE-502
    • Reference: https://lists.apache.org/thread/lr5d4tg6tf7j29jmw8wt242oowonjqpx

Linked advisories