Critical9.8Apache Software Foundation

Critical [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

This critical-severity Apache Software Foundation advisory covers CVE-2026-66713 affecting Apache Tomcat, Apache Axis2.

CVE-2026-66713 Published Jul 28, 2026Updated by vendor Jul 29, 2026

CVE-2026-66713

Affected products & platforms

Apache Software FoundationTomcat

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Summary

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.

Affected versions

through 2.0.0

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

2.0.1

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Users are recommended to upgrade to version 2.0.1, which fixes this issue by removing the clustering feature entirely.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed for the summary, affected/fixed versions and remediation guidance it provides.
Apache Software Foundation
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-66713 instead of the raw feed document.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-66713NVD CVE.org MITRE

Official resources

Apache Tomcat security bulletins (per major version) (target: 2.0.1)
Official documentation
This advisory names 2.0.1 as the first fixed release — official upgrade documentation for Apache Tomcat security bulletins (per major version).
ASF Security — reporting & CVE process
Official documentation
The Apache Software Foundation's official security page: how ASF CVEs are published and where each project's advisories live.
Apache project downloads (fixed releases)
Official documentation
Official ASF download tree — fetch the fixed release named in this advisory from the project's directory.

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