Vulnerability in Apache Software Foundation Apache CXF

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund8 Oct 2026WID-SEC-2026-3824

  Apache CXF: Multiple vulnerabilities Translated from German

  CVE-2026-78384CVE-2026-97791CVE-2026-108039+7 more CVEs

[ References ]References

• lists.apache.org/thread.html/mv5qfmd27gkbvt3k6by9db5bolrsbgy1Issue TrackingVendor Advisory
• www.openwall.com/lists/oss-security/2026/10/09/8Mailing ListThird Party Advisory