Quick answers
- Is CVE-2026-91866 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91866 being exploited in the wild.
- How severe is CVE-2026-91866?
- High severity, with a CVSS score of 7.5, published 21 September 2026.
- Which products and versions are affected?
- Apache Neethi before 3.2.4.
- Is there a fix for CVE-2026-91866?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-91866 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-91866?
- Check whether you run Apache Neethi at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability exists in Neethi's policy-intersection algorithm, which can be forced into exponential-time behavior when processing specially crafted WS-Policy documents. An unauthenticated attacker with network access can send malicious policy documents to trigger this condition, causing CPU exhaustion. The issue is resolved in version 3.2.4.
Affected products
- Apache Neethi before 3.2.4
Timeline
- 2026-09-21: disclosed