CVE-2026-86247

EUVD-2026-85270
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
apacheCNA
7.4 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
apachetomcat_native
2.0.0 ≤
𝑥
≤ 2.0.15
CNA
apachetomcat_native
1.3.0 ≤
𝑥
≤ 1.3.8
CNA
Debian logo
Debian Releases
Debian Product
Codename
tomcat-native
bookworm
vulnerable
forky
2.0.16-1
fixed
sid
2.0.16-1
fixed
trixie
vulnerable
Common Weakness Enumeration
References
https://lists.apache.org/thread/obsson6zhvfg0wsp2bx602l61ltj87r1
http://www.openwall.com/lists/oss-security/2026/09/23/33