Quick answers
- Is CVE-2026-86463 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-86463 being exploited in the wild.
- How severe is CVE-2026-86463?
- High severity, with a CVSS score of 7.5, published 9 October 2026.
- Which products and versions are affected?
- Apache CXF below 3.6.13, 4.1.9, 4.2.4.
- Is there a fix for CVE-2026-86463?
- Yes: fixed in CXF 3.6.13, 4.1.9, 4.2.4. Until then: Limit the size of incoming FIQL query expressions to 4 KiB or less to prevent excessive parser resource consumption. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-86463 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-86463?
- Check whether you run Apache CXF 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.
How to fix
- Fixed in: CXF 3.6.13, 4.1.9, 4.2.4
Limit the size of incoming FIQL query expressions to 4 KiB or less to prevent excessive parser resource consumption.
Technical details
The FIQL query parser uses a search pattern that exhibits catastrophic backtracking (ReDoS) when encountering long strings without operators, causing the parser to consume excessive CPU resources. The vulnerable component is the query expression parser; exploitation requires sending a crafted FIQL query over the network. A fix limits FIQL expressions to 4 KiB by default to prevent extremely long inputs.
Affected products
- Apache CXF below 3.6.13, 4.1.9, 4.2.4
Timeline
- 2026-10-09: disclosed