What is CVE-2026-86246?

CVE-2026-86246 is a critical-severity vulnerability in Apache Software Foundation Tomcat Native, classified under Initialization of a Resource with an Insecure Default. CVSS score: 9.1/10. Published 2026-09-23.

How severe is CVE-2026-86246?

Critical severity. CVSS v3 base score is 9.1 out of 10.

RCE in Apache Software Foundation Tomcat Native

CVE-2026-86246

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.

Published 2026-09-23 · last modified 2026-09-23.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Apache Software Foundation Tomcat Native

Weakness classification (CWE)

CWE-1188 — Initialization of a Resource with an Insecure Default

References

lists.apache.org/thread/dgyvfwb24nbk45ptvlhdyhdhl5o7k5ol (vendor-advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-86246?: CVE-2026-86246 is a critical-severity vulnerability in Apache Software Foundation Tomcat Native, classified under Initialization of a Resource with an Insecure Default. CVSS score: 9.1/10. Published 2026-09-23.
How severe is CVE-2026-86246?: Critical severity. CVSS v3 base score is 9.1 out of 10.