Vulnerability in Apache Software Foundation Apache Tomcat Native

[ Why it matters ]Priority signals

• Critical severity: CVSS 9.1

[ Description ]Official description

Initialization of a resource with an insecure default vulnerability in Apache Tomcat Native enabled insecure options by default including ALLOW_CLIENT_RENEGOTIATION, NO_EXTENDED_MASTER_SECRET, IGNORE_UNEXPECTED_EOF and ALLOW_NO_DHE_KEX. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier unsupported versions may also be affected. Users are recommended to upgrade to version 2.0.16 or 1.3.9, which fix the 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-Bund23 Sep 2026WID-SEC-2026-3559

  Apache Tomcat APR/native Connector: Multiple vulnerabilities Translated from German

  CVE-2026-86247CVE-2026-86246CVE-2026-86243

[ References ]References

• lists.apache.org/thread/dgyvfwb24nbk45ptvlhdyhdhl5o7k5olVendor AdvisoryMailing List
• www.openwall.com/lists/oss-security/2026/09/23/32Mailing ListThird Party Advisory