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CVE-2026-86247 Details

Description

Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate verification requirements to be down-graded for some configurations. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Unsupported versions may also be affected. Users are recommended to upgrade to version 2.0.16 or 1.3.9, which fixes the issue.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:7.4 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
http://www.openwall.com/lists/oss-security/2026/09/23/33	CVE	Mailing ListThird Party Advisory
https://lists.apache.org/thread/obsson6zhvfg0wsp2bx602l61ltj87r1	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-366	Race Condition within a Thread	[email protected]

Affected Products

Product	Versions
apache tomcat native	>= 1.3.0, < 1.3.9 >= 2.0.0, < 2.0.16
CPE cpe:2.3:a:apache:tomcat_native:::::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Oct 6, 2026	Initial Analysis	[email protected]
Sep 23, 2026	CVE Modified	CVE
Sep 23, 2026	CVE Modified	CISA-ADP
Sep 23, 2026	New CVE Received	[email protected]