Vulnerability-Lookup

CVE-2026-19202 (GCVE-0-2026-19202)

Vulnerability from cvelistv5 – Published: 2026-09-22 21:48 – Updated: 2026-09-23 15:01

Title

Token Cache Reuse in mcp-toolbox-sdk-python

Summary

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

9.1 (Critical)


                        
                          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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-23 15:01 UTC

CWE

CWE-524 - Use of a Shared Cache with Insufficient Key Granularity

Assigner

Google CNA under the Google root

CNA scorecard B 76/100 over 35 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/googleapis/mcp-toolbox-sdk-pyt…	patch

Impacted products

1 product

Vendor	Product	Version	CPE status
Google	mcp-toolbox-sdk-python	Affected: 0 , ≤ 1.1.0 (custom)	guessed

Credits

HE WEI（ギカク)

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-19202

Vulnerability from fkie_nvd - Published: 2026-09-22 22:17 - Updated: 2026-09-23 19:42

Severity

9.1 (Critical) - 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

Summary

References

	URL	Tags
	cve-coordination@google.com	https://github.com/googleapis/mcp-toolbox-sdk-python/pull/675

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-JCJP-GR26-563J

Vulnerability from github – Published: 2026-09-23 00:31 – Updated: 2026-09-23 00:31

Details

Severity

9.1 (Critical)


                  
                    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

Show details on source website

JSON

To clipboard

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    {
      "type": "WEB",
      "url": "https://github.com/googleapis/mcp-toolbox-sdk-python/pull/675"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-19202 (GCVE-0-2026-19202)

FKIE_CVE-2026-19202

GHSA-JCJP-GR26-563J

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour