CVE-2026-6242: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-m9ww-xwm5-pf57
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CWE-134
Published
Advisory Summary

CVE-2026-6242 is a MODERATE security vulnerability vulnerability (CWE-134: Use of Externally-Controlled Format String) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product uses a function that accepts a format string as an argument, but the format string originates from an external source.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-6242 at a Glance

CVE Identifier CVE-2026-6242
GHSA Identifier GHSA-m9ww-xwm5-pf57
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-134: Use of Externally-Controlled Format String
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-6242

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-2026-6242, 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-134: Use of Externally-Controlled Format String, where the product uses a function that accepts a format string as an argument, but the format string originates from an external source. 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

An authenticated format string vulnerability exists in the ONVIF Subscribe service in Tapo C520WS v2 due to improper handling of externally supplied parameters within formatting functions. An attacker may inject crafted format strings into event subscription requests or notification generation path to disrupt normal service execution. Successful exploitation may cause the event notification service to terminate unexpectedly, resulting in the loss of real-time alarm functionality and disruption of event notifications.

References

NVD — CVE-2026-6242 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-6242
www.tp-link.com/en/support/download... WEB
https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes
www.tp-link.com/us/support/download... WEB
https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes
www.tp-link.com/us/support/faq/5120 WEB
https://www.tp-link.com/us/support/faq/5120

Frequently Asked Questions

What is CVE-2026-6242?
CVE-2026-6242 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-134: Use of Externally-Controlled Format String.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-6242?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-6242?
CVE-2026-6242 is classified under CWE-134: Use of Externally-Controlled Format String (The product uses a function that accepts a format string as an argument, but the format string originates from an external source.).
How can I check Maven dependencies for CVE-2026-6242?
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-m9ww-xwm5-pf57",
  "modified" : "2026-06-06T00:31:38Z",
  "published" : "2026-06-06T00:31:38Z",
  "aliases" : [ "CVE-2026-6242" ],
  "details" : "An authenticated format string vulnerability exists in the ONVIF Subscribe service in Tapo C520WS v2 due to improper handling of externally supplied parameters within formatting functions. An attacker may inject crafted format strings into event subscription requests or notification generation path to disrupt normal service execution.\n\nSuccessful exploitation may cause the event notification service to terminate unexpectedly, resulting in the loss of real-time alarm functionality and disruption of event notifications.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/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-2026-6242"
  }, {
    "type" : "WEB",
    "url" : "https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes"
  }, {
    "type" : "WEB",
    "url" : "https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes"
  }, {
    "type" : "WEB",
    "url" : "https://www.tp-link.com/us/support/faq/5120"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-134" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-06-06T00:16:41Z"
  }
}