CVE-2026-86463 — Apache CXF: FIQL Query Parser Denial of Service

Description (CNA)

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 (CNA)

Vendor / product	Versions
Apache Software Foundation / Apache CXF	affected 4.2.0 before 4.2.4; affected 4.0.0 before 4.1.9; affected 0 before 3.6.13

CWE

No CWE identifiers supplied.

References

https://lists.apache.org/thread.html/mv5qfmd27gkbvt3k6by9db5bolrsbgy1

ADP enrichment

CVE

No English description supplied.

http://www.openwall.com/lists/oss-security/2026/10/09/8

CISA-ADP

No English description supplied.

No references supplied.