# CVE-2026-66713: Apache Axis2/Java: deserialization of untrusted Data

> Unauthenticated remote attackers can execute arbitrary code via crafted serialized objects in the Tribes clustering component, which is disabled by default.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Jul 2026
- **Updated:** 29 Jul 2026
- **Also known as:** GHSA-fhh8-qfj4-g948

## What is CVE-2026-66713?

CVE-2026-66713 is a critical unsafe deserialization vulnerability in Apache Axis2/Java, published on 28 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2026-66713?

It affects 1 product.


Products: Apache Axis2\/Java.

## How do I fix CVE-2026-66713?

No fix has been published for CVE-2026-66713 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-66713 being exploited?

There is no known exploitation of CVE-2026-66713 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-66713 and fix it if it is affected.

What it is: CVE-2026-66713 is a critical unsafe deserialization vulnerability in Apache Axis2/Java, published on 28 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-66713 in the wild and no public exploit code.

Affected product: Apache Axis2/Java. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-66713/ (Markdown: https://insights.sbomify.com/CVE-2026-66713/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-66713
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-66713
- OSV: https://osv.dev/vulnerability/CVE-2026-66713

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-66713/
Summaries are generated and may contain mistakes; the official description above is the record.