CVE-2026-102496 Apache XMLSchema: Denial of service through deeply nested schema structures

High 7.5 Published 29 Sep 2026 Updated 29 Sep 2026

Attackers can cause a denial of service by submitting deeply nested XML schemas, crashing the application via stack overflow.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-102496?

CVE-2026-102496 is a high-severity denial of service vulnerability in Apache XMLSchema, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Apache XmlSchema doesn't limit how deeply schema structures can be nested when it builds its schema model, so a malicious schema can make parsing recurse until the stack overflows. This causes a denial of service. Users are recommended to upgrade to version 2.3.3, which fixes this issue.

Weakness: CWE-674

Which versions are affected by CVE-2026-102496?

It affects 1 product.

Products include Apache Xmlschema.

How do I fix CVE-2026-102496?

No fix has been published for CVE-2026-102496 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-102496 being exploited?

There is no known exploitation of CVE-2026-102496 in the wild and no public exploit code.

Sources

Also known as GHSA-jp7g-xv94-gfw8.