Is there a public exploit for CVE-2026-90436?

Yes. Proof-of-concept code for CVE-2026-90436 has been published publicly.

Is there a proof of concept for CVE-2026-90436?

Yes — 1 proof-of-concept entry is linked on this page, from public repositories and community submissions. They are listed for authorised testing only.

How severe is CVE-2026-90436?

CVE-2026-90436 scores CVSS 9.8 (v3.1), rated critical.

9.8 Critical

UNSUPPORTED WHEN ASSIGNED Deserialization of an inbound SOAP fault in Apache Axis 1.x allows unauthenticated remote class instantiation.

CVE-2026-90436

UNSUPPORTED WHEN ASSIGNED Deserialization of an inbound SOAP fault in Apache Axis 1.x allows unauthenticated remote class instantiation. When a SOAP carries a element, Axis loads the named class and, if a String element is also present, instantiates it through its String constructor before checking that it is an AxisFault. Loading alone runs the class's static initializer. With a suitable class on the application's classpath this leads to remote code execution. The fault is parsed while the engine resolves the target service, before any per-service handler chain runs, so authentication handlers configured on a service do not protect against it. This affects all Apache Axis 1.x versions through 1.4. As Axis 1 has been EOL we recommend you migrate to a different SOAP engine, such as Apache Axis 2/Java. Alternatively you could use a build of Axis with the patch from https://github.com/apache/axis-axis1-java/commit/41f3b4e8d04e310ca81f86b92630ab2c11d608bd applied. The Apache Axis project does not expect to create an Axis 1.x release fixing this problem.

Proof-of-concept code is published

Public PoC

Public PoCfixedbyreboot/CVE-2026-90436-POC

Signals come from Exploit-DB, Metasploit, Nuclei and published proof-of-concept repositories. Their absence means nothing was found, not that nothing exists.

Assessment

CVSS: 9.8 (v3.1)
Severity: Critical
Known exploited: Not listed in CISA KEV
Exploit availability: Public PoC
Published: 6 November 2026
Last updated: 10 November 2026
Weakness: CWE-470
Assigner: security@apache.org

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

At the source

References

Community proofs of concept

No community proof of concept yet. If you have one for a published vulnerability and the right to share it, add it below — it will appear here once reviewed.

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