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Vulnerability record · CVE-2026-86246 · published 23 September 2026

CVE-2026-86246: Insecure default initialization vulnerability

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.

9.1 CVSS 3.1 Critical EPSS 0.28% · top 81.7% CWE-1188 · Insecure default initialization Awaiting Analysis
9.1CVSS 3.1 base score
0.28%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
23 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

LinkTags
https://lists.apache.org/thread/dgyvfwb24nbk45ptvlhdyhdhl5o7k5ol
http://www.openwall.com/lists/oss-security/2026/09/23/32

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Source: NIST National Vulnerability Database (record CVE-2026-86246), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.