CVE-2026-86247: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-jhrw-x5gg-jjqw
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CVSS 7.4
CWE-366
Published
Advisory Summary

CVE-2026-86247 is a HIGH (CVSS 7.4) security vulnerability vulnerability (CWE-366: Race Condition within a Thread) affecting Software libraries in the Maven ecosystem. The weakness occurs when if two threads of execution use a resource simultaneously, there exists the possibility that resources may be used while invalid, in turn making the state of execution undefined.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-86247 at a Glance

CVE Identifier CVE-2026-86247
GHSA Identifier GHSA-jhrw-x5gg-jjqw
Severity HIGH
CVSS v3.1 Base Score 7.4
CWE Classification CWE-366: Race Condition within a Thread
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-86247

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-86247, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-366: Race Condition within a Thread, where if two threads of execution use a resource simultaneously, there exists the possibility that resources may be used while invalid, in turn making the state of execution undefined. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

References

NVD — CVE-2026-86247 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86247
lists.apache.org/thread/obsson6zhvfg... WEB
https://lists.apache.org/thread/obsson6zhvfg0wsp2bx602l61ltj87r1
Software Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/09/23/33

Frequently Asked Questions

What is CVE-2026-86247?
CVE-2026-86247 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-366: Race Condition within a Thread.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-86247?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-86247?
CVE-2026-86247 has a CVSS v3.1 base score of 7.4 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-86247?
CVE-2026-86247 is classified under CWE-366: Race Condition within a Thread (If two threads of execution use a resource simultaneously, there exists the possibility that resources may be used while invalid, in turn making the state of execution undefined.).
How can I check Maven dependencies for CVE-2026-86247?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-jhrw-x5gg-jjqw",
  "modified" : "2026-09-23T21:30:35Z",
  "published" : "2026-09-23T15:30:48Z",
  "aliases" : [ "CVE-2026-86247" ],
  "details" : "Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate verification requirements to be down-graded for some configurations.\n\n\n\nThis 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.\n\n\n\nUsers are recommended to upgrade to version 2.0.16 or 1.3.9, which fixes the issue.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-86247"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/obsson6zhvfg0wsp2bx602l61ltj87r1"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/09/23/33"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-366" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-23T13:17:31Z"
  }
}