CVE-2026-55653: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-28f3-55mq-pp68
Share
CVSS 4.3
CWE-415
Published
Advisory Summary

CVE-2026-55653 is a MODERATE (CVSS 4.3) security vulnerability vulnerability (CWE-415: Double Free) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product calls free() twice on the same memory address.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-55653 at a Glance

CVE Identifier CVE-2026-55653
GHSA Identifier GHSA-28f3-55mq-pp68
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-415: Double Free
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.3

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:R/S:U/C:N/I:N/A:L).

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

How to Fix CVE-2026-55653

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-2026-55653, 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-415: Double Free, where the product calls free() twice on the same memory address. 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 OpenSSH. A malicious SSH server can exploit a double free vulnerability in the Diffie-Hellman Group Exchange (DH-GEX) client path. This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of Service (DoS).

References

NVD — CVE-2026-55653 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55653
access.redhat.com/errata/rhsa-2026:36... WEB
https://access.redhat.com/errata/RHSA-2026:36759
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82899
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82900
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82901
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82902
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82903
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82904
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82907
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82908
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82909
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82910
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82912
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82913
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82914
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82915
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82916
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82917
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82918
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82920
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82921
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82922
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82923
Software Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-55653
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2462351
access.redhat.com/errata/rhsa-2026:47... WEB
https://access.redhat.com/errata/RHSA-2026:47755
access.redhat.com/errata/rhsa-2026:47... WEB
https://access.redhat.com/errata/RHSA-2026:47756
access.redhat.com/errata/rhsa-2026:47... WEB
https://access.redhat.com/errata/RHSA-2026:47757
access.redhat.com/errata/rhsa-2026:54... WEB
https://access.redhat.com/errata/RHSA-2026:54387
access.redhat.com/errata/rhsa-2026:58... WEB
https://access.redhat.com/errata/RHSA-2026:58981
access.redhat.com/errata/rhsa-2026:76... WEB
https://access.redhat.com/errata/RHSA-2026:76748
access.redhat.com/errata/rhsa-2026:76... WEB
https://access.redhat.com/errata/RHSA-2026:76993
access.redhat.com/errata/rhsa-2026:80... WEB
https://access.redhat.com/errata/RHSA-2026:80513
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82749
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82750
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82751
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82752
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82753
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82754
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82755
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82756
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82757
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82758
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82759
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82761
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82762
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82763
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82897
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82898

Frequently Asked Questions

What is CVE-2026-55653?
CVE-2026-55653 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-415: Double Free.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-55653?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-55653?
CVE-2026-55653 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2026-55653?
CVE-2026-55653 is classified under CWE-415: Double Free (The product calls free() twice on the same memory address.).
How can I check Maven dependencies for CVE-2026-55653?
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-28f3-55mq-pp68",
  "modified" : "2026-10-14T21:32:49Z",
  "published" : "2026-06-23T06:30:41Z",
  "aliases" : [ "CVE-2026-55653" ],
  "details" : "A flaw was found in OpenSSH. A malicious SSH server can exploit a double free vulnerability in the Diffie-Hellman Group Exchange (DH-GEX) client path. This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of Service (DoS).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-55653"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:36759"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82899"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82900"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82901"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82902"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82903"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82904"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82907"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82908"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82909"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82910"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82912"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82913"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82914"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82915"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82916"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82917"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82918"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82920"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82921"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82922"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82923"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2026-55653"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2462351"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:47755"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:47756"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:47757"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:54387"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:58981"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:76748"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:76993"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:80513"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82749"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82750"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82751"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82752"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82753"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82754"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82755"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82756"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82757"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82758"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82759"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82761"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82762"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82763"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82897"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:82898"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-415" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-06-23T04:17:36Z"
  }
}