CVE-2026-36604: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-rv93-ggmg-88r9
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CVSS 6.5
CWE-350
Published
Advisory Summary

CVE-2026-36604 is a MODERATE (CVSS 6.5) security vulnerability vulnerability (CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product performs reverse dns resolution on an ip address to obtain the hostname and make a security decision, but it does not properly ensure that the ip address is truly associated with the hostname.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-36604 at a Glance

CVE Identifier CVE-2026-36604
GHSA Identifier GHSA-rv93-ggmg-88r9
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.5

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:H/I:N/A:N).

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

How to Fix CVE-2026-36604

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-2026-36604, 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-350: Reliance on Reverse DNS Resolution for a Security-Critical Action, where the product performs reverse dns resolution on an ip address to obtain the hostname and make a security decision, but it does not properly ensure that the ip address is truly associated with the hostname. 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

Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 does not validate the HTTP Host header, enabling DNS rebinding attacks. An external attacker can rebind a domain to the router's internal IP address, extending the CORS wildcard vulnerability (Access-Control-Allow-Origin: *) to internet-originated attacks.

References

NVD — CVE-2026-36604 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-36604
GitHub Advisory / Wiki ADVISORY
https://github.com/Tymbark7372/MERCUSYS-AC12G/blob/master/advisories/CVE-2026-36604.md

Frequently Asked Questions

What is CVE-2026-36604?
CVE-2026-36604 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-36604?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-36604?
CVE-2026-36604 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2026-36604?
CVE-2026-36604 is classified under CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action (The product performs reverse DNS resolution on an IP address to obtain the hostname and make a security decision, but it does not properly ensure that the IP address is truly associated with the hostname.).
How can I check Maven dependencies for CVE-2026-36604?
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-rv93-ggmg-88r9",
  "modified" : "2026-06-03T21:30:29Z",
  "published" : "2026-06-03T18:33:11Z",
  "aliases" : [ "CVE-2026-36604" ],
  "details" : "Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 does not validate the HTTP Host header, enabling DNS rebinding attacks. An external attacker can rebind a domain to the router's internal IP address, extending the CORS wildcard vulnerability (Access-Control-Allow-Origin: *) to internet-originated attacks.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-36604"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Tymbark7372/MERCUSYS-AC12G/blob/master/advisories/CVE-2026-36604.md"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-350" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-06-03T18:16:21Z"
  }
}