CVE-2026-86247: apache software foundation apache tomcat native Race Condition within a Thread
Vulnerability summary
CVE-2026-86247 is a high (CVSS 7.4) Race Condition within a Thread vulnerability in apache software foundation apache tomcat native. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.2% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 8 · Related 7Timeline
- 23-09-2026PublishedVulnerability first disclosed.
- 23-09-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.4HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- OSV · DebianEcosystem advisory · calculated7.4HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- NVDNIST7.4HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS trend
Probability
0.22%
Chance of exploitation in the next 30 days
Percentile
11%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Apache1 product
- tomcat_native≥ 1.3.0, < 1.3.9 | ≥ 2.0.0, < 2.0.16
Apache software foundation1 product
- apache tomcat native≥ 2.0.0, ≤ 2.0.15 | ≥ 1.3.0, ≤ 1.3.8
Debian1 product
- tomcat-nativeAll versions (No fix recorded) | < 2.0.16-1
Ubuntu1 product
- tomcat-nativeAll versions (No fix recorded)
4 vendors · 4 products
