CVE-2026-107938: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-vr34-m3cj-mgxg
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CVSS 9.1
CWE-297
Published
Advisory Summary

CVE-2026-107938 is a CRITICAL (CVSS 9.1) security vulnerability vulnerability (CWE-297: Improper Validation of Certificate with Host Mismatch) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-107938 at a Glance

CVE Identifier CVE-2026-107938
GHSA Identifier GHSA-vr34-m3cj-mgxg
Severity CRITICAL
CVSS v3.1 Base Score 9.1
CWE Classification CWE-297: Improper Validation of Certificate with Host Mismatch
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.1

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
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-2026-107938

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-2026-107938, 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-297: Improper Validation of Certificate with Host Mismatch, where the product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host. 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

In Apache CXF, the Netty-based HTTP client transport (cxf-rt-transports-http-netty-client) did not verify that the hostname in the server’s TLS certificate matched the host being called. This applied over both HTTP/1.1 and HTTP/2, even when disableCNCheck was left at its default value of false. The certificate chain was validated against the configured trust store, but the endpoint’s identity was not. A network attacker able to intercept traffic could present any certificate trusted by the client, such as a publicly issued certificate for a domain they control, and impersonate the target service. They could then read or modify the exchanged messages, including credentials.  Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.

References

NVD — CVE-2026-107938 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107938
lists.apache.org/thread.html/ljsjsq1... WEB
https://lists.apache.org/thread.html/ljsjsq1foyjy1v5o22oncw80twx7k2tc
Software Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/10/09/13

Frequently Asked Questions

What is CVE-2026-107938?
CVE-2026-107938 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-297: Improper Validation of Certificate with Host Mismatch.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-107938?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-107938?
CVE-2026-107938 has a CVSS v3.1 base score of 9.1 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-107938?
CVE-2026-107938 is classified under CWE-297: Improper Validation of Certificate with Host Mismatch (The product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host.).
How can I check Maven dependencies for CVE-2026-107938?
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-vr34-m3cj-mgxg",
  "modified" : "2026-10-15T18:31:42Z",
  "published" : "2026-10-09T12:31:43Z",
  "aliases" : [ "CVE-2026-107938" ],
  "details" : "In Apache CXF, the Netty-based HTTP client transport (cxf-rt-transports-http-netty-client) did not verify that the hostname in the server’s TLS certificate matched the host being called. This applied over both HTTP/1.1 and HTTP/2, even when disableCNCheck was left at its default value of false. The certificate chain was validated against the configured trust store, but the endpoint’s identity was not. A network attacker able to intercept traffic could present any certificate trusted by the client, such as a publicly issued certificate for a domain they control, and impersonate the target service. They could then read or modify the exchanged messages, including credentials. \nUsers are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-107938"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread.html/ljsjsq1foyjy1v5o22oncw80twx7k2tc"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/10/09/13"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-297" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-10-09T11:17:02Z"
  }
}