CVE-2026-93994: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-qc4p-9828-mv83
Share
CVSS 8.1
CWE-304
Published
Advisory Summary

CVE-2026-93994 is a HIGH (CVSS 8.1) security vulnerability vulnerability (CWE-304: Missing Critical Step in Authentication) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product implements an authentication technique, but it skips a step that weakens the technique.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-93994 at a Glance

CVE Identifier CVE-2026-93994
GHSA Identifier GHSA-qc4p-9828-mv83
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-304: Missing Critical Step in Authentication
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.1

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2026-93994

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-2026-93994, 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-304: Missing Critical Step in Authentication, where the product implements an authentication technique, but it skips a step that weakens the technique. 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

Apache MINA SSHD is a Java library for client-side and server-side SSH. SSH servers can be configured to require multi-authentication schemes, for instance two different public keys, not just one. In OpenSSH, this would be done by setting in sshd_config AuthenticationMethods "publickey,publickey". Apache MINA SSHD provides an equivalent configuration mechanism. In Apache MINA SSHD versions up to 2.19.0 and 3.0.0-M1 to 3.0.0-M5 the server code in component sshd-core does not enforce that the two public keys presented are different. A user can thus successfully authenticate with only one of the two key pairs required by presenting this single key twice. This is a partial authentication bypass. Users are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue.

References

NVD — CVE-2026-93994 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-93994
lists.apache.org/thread.html/9t3vsm8... WEB
https://lists.apache.org/thread.html/9t3vsm8rnvwdv9779mlg1lq2fbwojdwp
Software Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/09/29/33

Frequently Asked Questions

What is CVE-2026-93994?
CVE-2026-93994 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-304: Missing Critical Step in Authentication.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-93994?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-93994?
CVE-2026-93994 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-93994?
CVE-2026-93994 is classified under CWE-304: Missing Critical Step in Authentication (The product implements an authentication technique, but it skips a step that weakens the technique.).
How can I check Maven dependencies for CVE-2026-93994?
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-qc4p-9828-mv83",
  "modified" : "2026-09-30T12:35:16Z",
  "published" : "2026-09-30T12:35:15Z",
  "aliases" : [ "CVE-2026-93994" ],
  "details" : "Apache MINA SSHD is a Java library for client-side and server-side SSH. SSH servers can be configured to require multi-authentication schemes, for instance two different public keys, not just one. In OpenSSH, this would be done by setting in sshd_config AuthenticationMethods \"publickey,publickey\". Apache MINA SSHD provides an equivalent configuration mechanism.\n\n\n\n\nIn Apache MINA SSHD versions up to 2.19.0 and 3.0.0-M1 to 3.0.0-M5 the server code in component sshd-core does not enforce that the two public keys presented are different. A user can thus successfully authenticate with only one of the two key pairs required by presenting this single key twice. This is a partial authentication bypass.\n\n\n\n\n\n\nUsers are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-93994"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread.html/9t3vsm8rnvwdv9779mlg1lq2fbwojdwp"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/09/29/33"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-304" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-30T10:17:17Z"
  }
}