CVE-2026-82456: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-p2x5-x87w-v2xj
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CVSS 10.0
CWE-1327
Published
Advisory Summary

CVE-2026-82456 is a CRITICAL (CVSS 10.0) security vulnerability vulnerability (CWE-1327: Binding to an Unrestricted IP Address) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product assigns the address 0.0.0.0 for a database server, a cloud service/instance, or any computing resource that communicates remotely.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-82456 at a Glance

CVE Identifier CVE-2026-82456
GHSA Identifier GHSA-p2x5-x87w-v2xj
Severity CRITICAL
CVSS v3.1 Base Score 10.0
CWE Classification CWE-1327: Binding to an Unrestricted IP Address
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 10.0

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:C/C:H/I:H/A:H).

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

How to Fix CVE-2026-82456

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-2026-82456, 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-1327: Binding to an Unrestricted IP Address, where the product assigns the address 0.0.0.0 for a database server, a cloud service/instance, or any computing resource that communicates remotely. 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

argocd-mcp 0.8.0 binds its HTTP transport to every network interface and accepts MCP sessions without requiring caller credentials when ARGOCD_API_TOKEN is configured. Attackers who can reach the listener can invoke the full tool surface using the operator's stored token to create applications, request syncs, and modify Argo CD resources.

References

GitHub Advisory / Wiki ADVISORY
https://github.com/argoproj-labs/mcp-for-argocd/security/advisories/GHSA-rp45-5x3v-48mr
NVD — CVE-2026-82456 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-82456
Software Source Repository REPOSITORY
https://github.com/argoproj-labs/mcp-for-argocd
www.vulncheck.com/advisories/argocd-m... WEB
https://www.vulncheck.com/advisories/argocd-mcp-0.8.0-authentication-bypass-via-unauthenticated-http

Frequently Asked Questions

What is CVE-2026-82456?
CVE-2026-82456 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-1327: Binding to an Unrestricted IP Address.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-82456?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-82456?
CVE-2026-82456 has a CVSS v3.1 base score of 10.0 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
What CWE is associated with CVE-2026-82456?
CVE-2026-82456 is classified under CWE-1327: Binding to an Unrestricted IP Address (The product assigns the address 0.0.0.0 for a database server, a cloud service/instance, or any computing resource that communicates remotely.).
How can I check Maven dependencies for CVE-2026-82456?
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-p2x5-x87w-v2xj",
  "modified" : "2026-08-29T15:30:21Z",
  "published" : "2026-08-29T15:30:21Z",
  "aliases" : [ "CVE-2026-82456" ],
  "details" : "argocd-mcp 0.8.0 binds its HTTP transport to every network interface and accepts MCP sessions without requiring caller credentials when ARGOCD_API_TOKEN is configured. Attackers who can reach the listener can invoke the full tool surface using the operator's stored token to create applications, request syncs, and modify Argo CD resources.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/argoproj-labs/mcp-for-argocd/security/advisories/GHSA-rp45-5x3v-48mr"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-82456"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/argoproj-labs/mcp-for-argocd"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/argocd-mcp-0.8.0-authentication-bypass-via-unauthenticated-http"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1327" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-29T14:16:38Z"
  }
}