CVE-2026-85297 PUBLISHED

Bucket Squatting in Cloud Run MCP leads to Service Account Takeover

Assigner: GoogleCloud
Reserved: 03.09.2026 Published: 26.10.2026 Updated: 26.10.2026

Bucket Squatting in Google Cloud Run MCP versions prior to 1.11.0 on Google Cloud Platform allows an attacker to intercept and access proprietary source code, execute arbitrary code and exfiltrate data.

Users must upgrade to Cloud Run MCP version 1.11.0 or later.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/U:Amber
CVSS Score: 7.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	Low
Attack Complexity	Low	Integrity	High	Integrity	Low
Attack Requirements	Present	Availability	High	Availability	Low
Privileges Required	None
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	Google Cloud
Product	Cloud Run MCP
Versions	Default: unaffected affected from 0 to 1.11.0 (excl.)

Solutions

Users must upgrade to Cloud Run MCP version 1.11.0 or later.

Credits

lambdasawa (Tsubasa Irisawa) reporter

References

https://github.com/GoogleCloudPlatform/cloud-run-mcp/releases/tag/v1.11.0

Problem Types

CWE-340 Generation of Predictable Numbers or Identifiers CWE

Impacts

CAPEC-616 Establish Rogue Location