CVE-2026-91864 Apache Neethi: Crafted WS-Policy documents bypass element/attribute limits causing memory exhaustion

High 7.5 Published 21 Sep 2026 Updated 21 Sep 2026

Attackers can cause memory exhaustion and denial of service by sending crafted WS-Policy documents to applications using Apache Neethi.

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-2026-91864?

CVE-2026-91864 is a high-severity denial of service vulnerability in Apache Neethi, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A specially crafted WS-Policy document can pack unlimited content inside a policy assertion, which Neethi copies into memory without counting it against its size limits, exhausting the heap (denial of service). Users are recommended to upgrade to version 3.2.4, which fixes this issue.

Weakness: CWE-770

Which versions are affected by CVE-2026-91864?

It affects 1 product.

Products include Apache Neethi.

How do I fix CVE-2026-91864?

No fix has been published for CVE-2026-91864 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-2026-91864 being exploited?

There is no known exploitation of CVE-2026-91864 in the wild and no public exploit code.

Sources

Also known as GHSA-cw6x-vx7r-8x4q.