CVE-2026-93493: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-9rhx-p462-pg2j
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CVSS 5.9
CWE-299
Published
Advisory Summary

CVE-2026-93493 is a MODERATE (CVSS 5.9) security vulnerability vulnerability (CWE-299: Improper Check for Certificate Revocation) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not check or incorrectly checks the revocation status of a certificate, which may cause it to use a certificate that has been compromised.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-93493 at a Glance

CVE Identifier CVE-2026-93493
GHSA Identifier GHSA-9rhx-p462-pg2j
Severity MODERATE
CVSS v3.1 Base Score 5.9
CWE Classification CWE-299: Improper Check for Certificate Revocation
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.9

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:N/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 None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-93493

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-2026-93493, 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-299: Improper Check for Certificate Revocation, where the product does not check or incorrectly checks the revocation status of a certificate, which may cause it to use a certificate that has been compromised. 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

A flaw was found in Netty's `netty-handler-ssl-ocsp` component. A remote attacker can exploit this vulnerability by providing an Online Certificate Status Protocol (OCSP) response that omits the optional `nextUpdate` field. This omission causes the OCSP validation to be silently skipped, leading to applications proceeding with an unvalidated certificate. This can result in a bypass of security controls where certificate validation is expected.

References

NVD — CVE-2026-93493 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-93493
Software Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-93493
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2536897

Frequently Asked Questions

What is CVE-2026-93493?
CVE-2026-93493 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-299: Improper Check for Certificate Revocation.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-93493?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-93493?
CVE-2026-93493 has a CVSS v3.1 base score of 5.9 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2026-93493?
CVE-2026-93493 is classified under CWE-299: Improper Check for Certificate Revocation (The product does not check or incorrectly checks the revocation status of a certificate, which may cause it to use a certificate that has been compromised.).
How can I check Maven dependencies for CVE-2026-93493?
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-9rhx-p462-pg2j",
  "modified" : "2026-09-18T12:31:16Z",
  "published" : "2026-09-18T09:31:08Z",
  "aliases" : [ "CVE-2026-93493" ],
  "details" : "A flaw was found in Netty's `netty-handler-ssl-ocsp` component. A remote attacker can exploit this vulnerability by providing an Online Certificate Status Protocol (OCSP) response that omits the optional `nextUpdate` field. This omission causes the OCSP validation to be silently skipped, leading to applications proceeding with an unvalidated certificate. This can result in a bypass of security controls where certificate validation is expected.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-93493"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2026-93493"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2536897"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-299" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-18T08:17:02Z"
  }
}