critical 9.1

CVE-2026-86246 json

Apache Tomcat Native: Insecure OpenSSL options enabled

published 2026-09-23 last mo. modified 2026-10-06 last mo. also EUVD-2026-85268

cvss: 9.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 distros 4

apache tomcat_native 1.3.9, 2.0.16

debian suse opensuse alpine

tomcat-native Debian 14 2.0.16-1

debian advisories DEBIAN-CVE-2026-86246

libtcnative-2-0 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +9 more 2.0.16-150400.9.6.1
tomcat10 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES 15 SP6-LTSS +4 more 10.1.60-150200.5.82.2
tomcat SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 9.0.122-150200.123.2
libtcnative-1-0 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 1.3.9-150200.6.11.2
tomcat11 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Web and Scripting 15 SP7 11.0.26-150600.13.36.2
libtcnative-1-0 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Web and Scripting 15 SP7 +1 more 1.3.9-150600.16.9.2
tomcat11 SLES for SAP applications 16.0, SLES 16.0 11.0.26-160000.1.1
tomcat SLES for SAP applications 16.0, SLES 16.0 9.0.122-160000.1.1

suse advisories SUSE-SU-2026:4927-1 SUSE-SU-2026:4658-1 SUSE-SU-2026:4546-1 SUSE-SU-2026:4544-1 SUSE-SU-2026:23985-1

tomcat11 openSUSE Leap 16.0 11.0.26-160000.1.1
tomcat openSUSE Leap 16.0 9.0.122-160000.1.1
tomcat10 openSUSE Leap 16.0 10.1.60-160000.1.1
libtcnative-1-0 openSUSE Leap 16.0 1.3.9-160000.1.1
libtcnative-2-0 openSUSE Leap 16.0 2.0.16-160000.1.1
libtcnative-1-0 openSUSE Tumbleweed 1.3.9-1.1
libtcnative-2-0 openSUSE Tumbleweed 2.0.16-1.1

opensuse advisories openSUSE-SU-2026:21984-1 openSUSE-SU-2026:11898-1 openSUSE-SU-2026:11899-1

tomcat-native Alpine 3.24 2.0.16-r0

alpine advisories ALPINE-CVE-2026-86246

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-86246 updated 2026-11-09 cvss 5.3

tomcat-native: Apache Tomcat Native: Weakened TLS connection security via insecure default configuration

Red Hat JBoss Web Server 6.2 on RHEL 8 jws6-tomcat-native 1.3.6-2.redhat_2.el8jws, jws6-tomcat 10.1.49-18.redhat_00018.1.el8jws, jws6-tomcat-lib 10.1.49-18.redhat_00018.1.el8jws, jws6-mod_cluster 2.0.5-1.Final_redhat_00001.1.el8jws, jws6-tomcat-javadoc 10.1.49-18.redhat_00018.1.el8jws, jws6-tomcat-selinux 10.1.49-18.redhat_00018.1.el8jws, +7 more Red Hat JBoss Web Server 6.2 on RHEL 9 jws6-tomcat-native 1.3.6-2.redhat_2.el9jws, jws6-tomcat 10.1.49-18.redhat_00018.1.el9jws, jws6-tomcat-lib 10.1.49-18.redhat_00018.1.el9jws, jws6-mod_cluster 2.0.5-1.Final_redhat_00001.1.el9jws, jws6-tomcat-javadoc 10.1.49-18.redhat_00018.1.el9jws, jws6-tomcat-selinux 10.1.49-18.redhat_00018.1.el9jws, +7 more Red Hat JBoss Web Server 6.2 on RHEL 10 jws6-tomcat-native 1.3.6-2.redhat_2.el10jws, jws6-tomcat 10.1.49-18.redhat_00018.1.el10jws, jws6-tomcat-lib 10.1.49-18.redhat_00018.1.el10jws, jws6-mod_cluster 2.0.5-1.Final_redhat_00001.1.el10jws, jws6-tomcat-javadoc 10.1.49-18.redhat_00018.1.el10jws, jws6-tomcat-selinux 10.1.49-18.redhat_00018.1.el10jws, +7 more
fixed: vendor fix RHSA-2026:96228
Red Hat JBoss Web Server 6.2.6
fixed: vendor fix RHSA-2026:96229
Red Hat JBoss Web Server 7.0 on RHEL 8 jws7-tomcat-native 1.3.7-4.redhat_4.el8jws, jws7-tomcat 11.0.21-10.redhat_00010.1.el8jws, jws7-tomcat-lib 11.0.21-10.redhat_00010.1.el8jws, jws7-mod_cluster 2.1.1-1.Final_redhat_00001.1.el8jws, jws7-tomcat-javadoc 11.0.21-10.redhat_00010.1.el8jws, jws7-tomcat-selinux 11.0.21-10.redhat_00010.1.el8jws, +7 more Red Hat JBoss Web Server 7.0 on RHEL 9 jws7-tomcat-native 1.3.7-4.redhat_4.el9jws, jws7-tomcat 11.0.21-10.redhat_00010.1.el9jws, jws7-tomcat-lib 11.0.21-10.redhat_00010.1.el9jws, jws7-mod_cluster 2.1.1-1.Final_redhat_00001.1.el9jws, jws7-tomcat-javadoc 11.0.21-10.redhat_00010.1.el9jws, jws7-tomcat-selinux 11.0.21-10.redhat_00010.1.el9jws, +7 more Red Hat JBoss Web Server 7.0 on RHEL 10 jws7-tomcat-native 1.3.7-4.redhat_4.el10jws, jws7-tomcat 11.0.21-10.redhat_00010.1.el10jws, jws7-tomcat-lib 11.0.21-10.redhat_00010.1.el10jws, jws7-mod_cluster 2.1.1-1.Final_redhat_00001.1.el10jws, jws7-tomcat-javadoc 11.0.21-10.redhat_00010.1.el10jws, jws7-tomcat-selinux 11.0.21-10.redhat_00010.1.el10jws, +7 more
fixed: vendor fix RHSA-2026:93618
Red Hat JBoss Web Server 7.0.3
fixed: vendor fix RHSA-2026:93622

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: last mo. (2026-09-23)

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CNA	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Apache Software Foundation Apache Tomcat Native

Classification

Weakness

CWE-1188 Initialization of a Resource with an Insecure Default

References

lists.apache.org /thread/dgyvfwb24nbk45ptvlhdyhdhl5o7k5ol
vendor-advisory, mailing-list
openwall.com /lists/oss-security/2026/09/23/32
mailing-list, third-party-advisory

Sources

CVE List CVE-2026-86246
NVD CVE-2026-86246

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

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