What is CVE-2026-66713?

CVE-2026-66713 is a critical-severity vulnerability in Apache Axis2\/java, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-07-28.

How severe is CVE-2026-66713?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Deserialization in Apache Axis2\/java

CVE-2026-66713

Deserialization of Untrusted Data (CWE-502) in the Tribes-based clustering component in Apache Software Foundation Apache Axis2/Java through 2.0.0 on Apache Tomcat (only when Tribes clustering is enabled, which is off by default) allows an unauthenticated remote attacker with network access to the clustering port to execute arbitrary code via a crafted serialized Java object delivered to the cluster channel and deserialized in org.apache.axis2.clustering.tribes.Axis2ChannelListener#messageReceived. Users are recommended to upgrade to version 2.0.1, which fixes this issue by removing the clustering feature entirely.

Vulnerability class: Insecure Deserialization

EPSS: 0.010 (61.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Apache Axis2\/java
Apache Software Foundation Axis2/java — versions 0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

security@apache.org (Patch, patch)
security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-66713?: CVE-2026-66713 is a critical-severity vulnerability in Apache Axis2\/java, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-07-28.
How severe is CVE-2026-66713?: Critical severity. CVSS v3 base score is 9.8 out of 10.