CVE-2026-86246Network attack vectorHinoki check available

TLS protections weakened by truncated OpenSSL option flags

Published Sep 23, 2026 · Updated Sep 23, 2026

Insecure defaults in Apache Tomcat Native 1.3.0 through 1.3.8 and 2.0.0 through 2.0.15 allow remote attackers to weaken TLS protections. The SSL and SSLContext option bridges accept 32-bit Java integers, truncating OpenSSL 3 option masks and leaving extended insecure defaults enabled. Exposure requires Tomcat to load Native with OpenSSL for TLS; enabled renegotiation and weakened handshake safeguards reduce connection security.

CVSS severityUnavailable
Unscored
EPSS probability0.36%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Insecure defaults in Apache Tomcat Native 1.3.0 through 1.3.8 and 2.0.0 through 2.0.15 allow remote attackers to weaken TLS protections. The SSL and SSLContext option bridges accept 32-bit Java integers, truncating OpenSSL 3 option masks and leaving extended insecure defaults enabled. Exposure requires Tomcat to load Native with OpenSSL for TLS; enabled renegotiation and weakened handshake safeguards reduce connection security.

The record

CVE
CVE-2026-86246
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
The Apache Software Foundation
Product
Apache Tomcat Native
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.3.0 <=1.3.8
  2. Affected versionversion=2.0.0 <=2.0.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Tomcat Nativeversion=1.3.0 <=1.3.8; version=2.0.0 <=2.0.15

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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