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.
Fix
Patch, vendor advisory and mitigation references on NVD 1
- https://lists.apache.org/thread.html/mv5qfmd27gkbvt3k6by9db5bolrsbgy1 Issue Tracking, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 5
- Cpes+1 CPE criteria (now 1)NVD modified 2026-10-20 12:41
- StatusUndergoing Analysis → AnalyzedNVD modified 2026-10-20 12:41
- CwesCWE-400NVD modified 2026-10-15 17:17
- CVSS7.5 (v3.1, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)NVD modified 2026-10-15 17:17
- First seenunscoredNVD modified 2026-10-09 16:33
Affected (CPE criteria) 1
cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:*
References 2
- https://lists.apache.org/thread.html/mv5qfmd27gkbvt3k6by9db5bolrsbgy1 Issue Tracking, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/10/09/8 Mailing List, Third Party Advisory