CVE-2026-19202: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-jcjp-gr26-563j
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CWE-524
Published
Advisory Summary

CVE-2026-19202 is a CRITICAL security vulnerability vulnerability (CWE-524: Use of Cache Containing Sensitive Information) affecting Software libraries in the Maven ecosystem. The weakness occurs when the code uses a cache that contains sensitive information, but the cache can be read by an actor outside of the intended control sphere.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-19202 at a Glance

CVE Identifier CVE-2026-19202
GHSA Identifier GHSA-jcjp-gr26-563j
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-524: Use of Cache Containing Sensitive Information
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-19202

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-2026-19202, 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-524: Use of Cache Containing Sensitive Information, where the code uses a cache that contains sensitive information, but the cache can be read by an actor outside of the intended control sphere. 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 caching flaw in the toolbox-core package of the mcp-toolbox-sdk-python SDK causes the same Google ID token to be cached and reused across different audiences. If an application uses the SDK to authenticate to two or more different audiences within the same process, the module-level token cache fails to key its cached tokens by the requested audience. Consequently, a valid, unexpired token minted for a sensitive service (Service A) can be retrieved from the cache and sent to a secondary service (Service B). An attacker who operates, compromises, or monitors traffic to Service B can capture this token and replay it to impersonate the victim application against Service A.

References

NVD — CVE-2026-19202 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-19202
Software Source Repository REPOSITORY
https://github.com/googleapis/mcp-toolbox-sdk-python/pull/675

Frequently Asked Questions

What is CVE-2026-19202?
CVE-2026-19202 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-524: Use of Cache Containing Sensitive Information.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-19202?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-19202?
CVE-2026-19202 is classified under CWE-524: Use of Cache Containing Sensitive Information (The code uses a cache that contains sensitive information, but the cache can be read by an actor outside of the intended control sphere.).
How can I check Maven dependencies for CVE-2026-19202?
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-jcjp-gr26-563j",
  "modified" : "2026-09-23T00:31:14Z",
  "published" : "2026-09-23T00:31:14Z",
  "aliases" : [ "CVE-2026-19202" ],
  "details" : "A caching flaw in the toolbox-core package of the mcp-toolbox-sdk-python SDK causes the same Google ID token to be cached and reused across different audiences. If an application uses the SDK to authenticate to two or more different audiences within the same process, the module-level token cache fails to key its cached tokens by the requested audience. Consequently, a valid, unexpired token minted for a sensitive service (Service A) can be retrieved from the cache and sent to a secondary service (Service B). An attacker who operates, compromises, or monitors traffic to Service B can capture this token and replay it to impersonate the victim application against Service A.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/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-2026-19202"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/googleapis/mcp-toolbox-sdk-python/pull/675"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-524" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-22T22:17:11Z"
  }
}