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Apache Tomcat Native CVE-2026-86246

| EUVDEUVD-2026-85268 CRITICAL
Initialization of a Resource with an Insecure Default (CWE-1188)
2026-09-23 apache GHSA-9p2m-jvmj-wh8q
Apache Information Disclosure OpenSSL Tomcat Suse Apache Tomcat Native Apache Software Foundation
9.1
CVSS 3.1 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
9.1 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
vuln.today AI
4.8 MEDIUM

Exploiting weakened TLS defaults needs an active MitM/on-path position (AC:H); impact is partial degradation of channel confidentiality and integrity (C:L/I:L), not full compromise.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
SUSE
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

5
Analysis Updated
Sep 23, 2026 - 16:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Sep 23, 2026 - 16:22 vuln.today
cvss_changed
CVSS changed
Sep 23, 2026 - 16:22 NVD
9.1 (CRITICAL)
Metadata Corrected
Sep 23, 2026 - 13:40 vuln.today
tag: OpenSSL added
Analysis Generated
Sep 23, 2026 - 13:03 vuln.today

DescriptionCVE.org

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.

Articles & Coverage 1

News Critical TLS Misconfiguration in Apache Tomcat Native - CVE-2026-86246 Sep 23, 2026

AnalysisAI

Insecure-by-default OpenSSL options in Apache Tomcat Native (versions 2.0.0 through 2.0.15 and 1.3.0 through 1.3.8) silently weaken the TLS layer used by the APR/OpenSSL connector, enabling insecure client-initiated renegotiation, disabling the Extended Master Secret extension, ignoring unexpected EOF (truncation), and permitting key exchanges without (EC)DHE forward secrecy. The vendor scored this 9.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/C:H/I:H/A:N), but our independent assessment rates it substantially lower - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N - because meaningful abuse requires an on-path/man-in-the-middle attacker who can actively position themselves between client and server, and because the four options are only applied when the deployment has not explicitly overridden them. …

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Vulnerability AssessmentAI

Exploitation Exploitation requires the Tomcat instance to use the Apache Tomcat Native (APR/OpenSSL) TLS connector at an affected version (2.0.0-2.0.15 or 1.3.0-1.3.8) WITHOUT the application having explicitly overridden the insecure defaults (ALLOW_CLIENT_RENEGOTIATION, NO_EXTENDED_MASTER_SECRET, IGNORE_UNEXPECTED_EOF, ALLOW_NO_DHE_KEX). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor (Apache) CVSS 9.1 with C:H/I:H/AV:N/AC:L/PR:N appears substantially inflated relative to the actual defect. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: Apache Tomcat Native 2.0.16 or 1.3.9 - upgrade the libtcnative library on the host (or in the container image) to the branch matching the Tomcat generation in use, then restart Tomcat so the APR connector reloads the library; the vendor advisory is at https://lists.apache.org/thread/dgyvfwb24nbk45ptvlhdyhdhl5o7k5ol. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Apache Tomcat instances and identify those using the Apache Tomcat Native APR/OpenSSL connector with Tomcat Native versions 2.0.0 through 2.0.15 or 1.3.0 through 1.3.8; where possible, switch affected connectors to JSSE/NIO or explicitly override the insecure OpenSSL/TLS options to enforce secure renegotiation, Extended Master Secret, truncation rejection, and (EC)DHE forward secrecy, and restrict network exposure. …

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Module for Basesystem 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Fixed

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CVE-2026-86246 vulnerability details – vuln.today
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