---
id: CVE-2026-86463
title: >-
  Apache CXF's FIQL query parser has a vulnerability in how it searches for
  operators in query expressions
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 …
severity: none
published: '2026-10-09'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T16:33:39.007'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86463'
references:
  - url: 'https://lists.apache.org/thread.html/mv5qfmd27gkbvt3k6by9db5bolrsbgy1'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/10/09/8'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
ingestedAt: '2026-10-09T12:53:29.301Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.