---
id: CVE-2026-86246
title: "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.…"
summary: "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.…"
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-1188
vendor: apache
product: tomcat_native
affected:
  - 'tomcat_native >= 1.3.0, < 1.3.9'
  - 'tomcat_native >= 2.0.0, < 2.0.16'
patched:
  - tomcat_native 2.0.16
published: '2026-09-23'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T13:50:57.873'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86246'
references:
  - url: 'https://lists.apache.org/thread/dgyvfwb24nbk45ptvlhdyhdhl5o7k5ol'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/09/23/32'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
epss: 0.00347
epssPercentile: 0.28119
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-23T15:29:46.583140Z'
ingestedAt: '2026-09-23T13:24:43.399Z'
---

## Overview

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.

## Affected

- `tomcat_native >= 1.3.0, < 1.3.9`
- `tomcat_native >= 2.0.0, < 2.0.16`

## Remediation

Upgrade past the affected range:

- `tomcat_native 2.0.16`