CVE-2026-11834: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-w296-94hj-pfcg
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CWE-78
Published
Advisory Summary

CVE-2026-11834 is a HIGH security vulnerability vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product constructs all or part of an os command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended os command when it is sent to a downstream component.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-11834 at a Glance

CVE Identifier CVE-2026-11834
GHSA Identifier GHSA-w296-94hj-pfcg
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-11834

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-2026-11834, 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-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), where the product constructs all or part of an os command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended os command when it is sent to a downstream component. 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 command injection vulnerability has been identified in the DHCP option processing logic in multiple TP-Link router models, due to insufficient validation of externally supplied DHCP option data. An adjacent attacker may exploit this vulnerability by supplying crafted DHCP responses, potentially resulting in unauthorized command execution during device initialization or provisioning workflows. This typically occurs when the device is in a factory-default or unconfigured state. Successful exploitation may allow an adjacent, unauthenticated attacker to execute arbitrary commands with elevated privileges, potentially leading to full compromise of the affected device and unauthorized administrative control.

References

NVD — CVE-2026-11834 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-11834
mattg.systems/posts/cve-2026-1183... WEB
https://mattg.systems/posts/cve-2026-11834
www.tp-link.com/en/support/download... WEB
https://www.tp-link.com/en/support/download/archer-c20
www.tp-link.com/en/support/download... WEB
https://www.tp-link.com/en/support/download/archer-mr200/#Firmware
www.tp-link.com/en/support/download... WEB
https://www.tp-link.com/en/support/download/archer-mr402/#Firmware
www.tp-link.com/en/support/download... WEB
https://www.tp-link.com/en/support/download/archer-vr2100/#Firmware
www.tp-link.com/en/support/download... WEB
https://www.tp-link.com/en/support/download/tl-mr6400/v7/#Firmware
www.tp-link.com/us/support/download... WEB
https://www.tp-link.com/us/support/download/archer-c20
www.tp-link.com/us/support/faq/5141 WEB
https://www.tp-link.com/us/support/faq/5141

Frequently Asked Questions

What is CVE-2026-11834?
CVE-2026-11834 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-11834?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-11834?
CVE-2026-11834 is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') (The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.).
How can I check Maven dependencies for CVE-2026-11834?
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-w296-94hj-pfcg",
  "modified" : "2026-06-27T00:30:29Z",
  "published" : "2026-06-22T21:30:59Z",
  "aliases" : [ "CVE-2026-11834" ],
  "details" : "A command\ninjection vulnerability has been identified in the DHCP option processing logic\nin multiple TP-Link router models, due to insufficient validation of externally\nsupplied DHCP option data. An adjacent attacker may exploit this\nvulnerability by supplying crafted DHCP responses, potentially resulting in unauthorized\ncommand execution during device initialization or provisioning workflows. This\ntypically occurs when the device is in a factory-default or unconfigured state.\n\n\n\n\n\nSuccessful\nexploitation may allow an adjacent, unauthenticated attacker to execute\narbitrary commands with elevated privileges, potentially leading to full\ncompromise of the affected device and unauthorized administrative control.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-11834"
  }, {
    "type" : "WEB",
    "url" : "https://mattg.systems/posts/cve-2026-11834"
  }, {
    "type" : "WEB",
    "url" : "https://www.tp-link.com/en/support/download/archer-c20"
  }, {
    "type" : "WEB",
    "url" : "https://www.tp-link.com/en/support/download/archer-mr200/#Firmware"
  }, {
    "type" : "WEB",
    "url" : "https://www.tp-link.com/en/support/download/archer-mr402/#Firmware"
  }, {
    "type" : "WEB",
    "url" : "https://www.tp-link.com/en/support/download/archer-vr2100/#Firmware"
  }, {
    "type" : "WEB",
    "url" : "https://www.tp-link.com/en/support/download/tl-mr6400/v7/#Firmware"
  }, {
    "type" : "WEB",
    "url" : "https://www.tp-link.com/us/support/download/archer-c20"
  }, {
    "type" : "WEB",
    "url" : "https://www.tp-link.com/us/support/faq/5141"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-78" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-06-22T19:16:38Z"
  }
}