Advisory severityUnratedApache Software Foundation Updated

Advisory [CVE-2026-86463] Apache CXF's FIQL query parser has a vulnerability in how it searches for operators in query expressions

This security Apache Software Foundation advisory covers CVE-2026-86463; related products: Apache CXF.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-86463 Source published Oct 9, 2026Source updated Oct 9, 2026

VulniPulse record published Oct 9, 2026Record updated Oct 9, 2026

CVE-2026-86463

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Summary

Apache CXF's FIQL query parser has a vulnerability in how it searches for operators in query expressions. The search pattern can get stuck trying many combinations when it encounters a long string without an operator, causing the parser to consume excessive CPU time.

An attacker can send a crafted query to make the server use up CPU resources, potentially slowing down or stopping other requests. The fix was to limit FIQL expressions to 4 KiB by default, preventing attackers from sending extremely long inputs while still allowing normal queries.

Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.

Affected versions

Apache CXF 4.2.0 before 4.2.4
Apache CXF 4.0.0 before 4.1.9
Apache CXF before 3.6.13

Official advisory · medium-confidence parse· fetched 16 hours ago·verify at source

Fixed versions

4.2.4
4.1.9
3.6.13

Official advisory · medium-confidence parse· fetched 16 hours ago·verify at source

Mitigation checklist

Recommended fix / mitigation

The fix was to limit FIQL expressions to 4 KiB by default, preventing attackers from sending extremely long inputs while still allowing normal queries.
Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.

Official advisory · medium-confidence parse· fetched 16 hours ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Apache Software Foundation
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-86463 instead of the raw feed document.
CVE Program

Cross-references

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CVE-2026-86463NVD CVE.org MITRE

Official resources

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Official documentation
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Apache project downloads (fixed releases)
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