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Fencer Intel
high 7.5

CVE-2026-86243 json

Apache Tomcat Native: DoS via TLS handshake

published last mo. modified last mo. also EUVD-2026-85267

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

Summary

Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash.

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 1.3.9 or 2.0.16, which fix the issue.

Patch / fix

  • apache tomcat_native 1.3.9, 2.0.16
  • tomcat-native Debian 14 2.0.16-1

debian advisories DEBIAN-CVE-2026-86243

  • 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-2026:4927-1SUSE-SU-2026:4658-1SUSE-SU-2026:4546-1SUSE-SU-2026:4544-1SUSE-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-2026:21984-1openSUSE-SU-2026:11898-1openSUSE-SU-2026:11899-1

  • tomcat-native Alpine 3.24 2.0.16-r0

alpine advisories ALPINE-CVE-2026-86243

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

Is CVE-2026-86243 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2026-86243 updated cvss 7.5

tomcat-native: Apache Tomcat Native: Denial of Service via buffer over-read during TLS handshake

  • 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
partial
Assessed
last mo.

Exploit prediction

0.56% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Apache Software Foundation Apache Tomcat Native

Classification

Weakness

References

Sources

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.