CVE-2026-86246 Apache Tomcat Native - Insecure Default Configuration

Apache Tomcat Native 2.0.0 through 2.0.15 and 1.3.0 through 1.3.8 contain an insecure default configuration caused by enabled insecure options including ALLOW_CLIENT_RENEGOTIATION, NO_EXTENDED_MASTER_SECRET, IGNORE_UNEXPECTED_EOF, and ALLOW_NO_DHE_KEX, letting attackers exploit weakened security, exploit requires no special conditions.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.36% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Insecure Default Configuration
Impact
Man In The Middle
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
23 September 2026
Updated
15 October 2026
Weakness
CWE-1188

Vendor fix

Upgrade to version 2.0.16 or 1.3.9 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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