Quick answers
- Is CVE-2026-91863 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91863 being exploited in the wild.
- How severe is CVE-2026-91863?
- 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-2026-91863?
- 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-2026-91863 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-91863?
- 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 WS-Policy parser, which fails to properly enforce its nesting-depth limit when processing maliciously crafted policy documents. An attacker can send a specially constructed WS-Policy XML document that triggers recursive parsing without hitting the depth limit, leading to stack exhaustion and parser crash. This is a network-accessible denial of service affecting applications using Neethi versions before 3.2.4.
Affected products
- Apache Neethi before 3.2.4
Timeline
- 2026-09-21: disclosed