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CVE-2026-19202— Token Cache Reuse in mcp-toolbox-sdk-python

Quick assessment

Affected
Google mcp-toolbox-sdk-python
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 p

CVSS 9.1 · Critical
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I. Basic Information for CVE-2026-19202

Vulnerability Information

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Vulnerability Title
Token Cache Reuse in mcp-toolbox-sdk-python
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
通过缓存导致的信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Google mcp-toolbox-sdk-python 0 ~ 1.1.0 -

II. Public POCs for CVE-2026-19202

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III. Intelligence Information for CVE-2026-19202

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Patches & Fixes for CVE-2026-19202 (1)

IV. Related Vulnerabilities

Same vendor: Google
Same weakness: CWE-524

V. Comments for CVE-2026-19202

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