# CVE-2026-85297: Bucket Squatting in Cloud Run MCP leads to Service Account Takeover

Status: published. Published: 2026-10-26. Updated: 2026-11-02.

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.

## Remediation

- fix: Users must upgrade to Cloud Run MCP version 1.11.0 or later. (source: CNA: GoogleCloud)

## Affected products and versions

- Google Cloud / Cloud Run MCP: ≥ 0; < 1.11.0 (affected, custom). Source: CNA: GoogleCloud

## Severity and prioritization

- CVSS 4.0: 7.7 (high); 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; source: CNA: GoogleCloud

- CVSS 4.0: 7.7 (high); 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/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:Amber; source: NVD: f45cbf4e-4146-4068-b7e1-655ffc2c548c

- CISA KEV: No listing in collected sources

- EPSS: 0.31% as of 2026-11-02; percentile 24.31%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-340

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/GoogleCloudPlatform/cloud-run-mcp/releases/tag/v1.11.0 (CNA: GoogleCloud)

- https://github.com/GoogleCloudPlatform/cloud-run-mcp/releases/tag/v1.11.0 (f45cbf4e-4146-4068-b7e1-655ffc2c548c)

## Provenance

- CNA: GoogleCloud: https://www.cve.org/CVERecord?id=CVE-2026-85297; retrieved 2026-11-02; source updated 2026-11-02

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-85297; retrieved 2026-11-03; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-85297; retrieved 2026-11-02; source updated Not reported

Revision: 9ce635787e5b4ed889387e0ea28031dedd7151563b76a49089f528398a263899

Canonical: https://y2.dev/cve/CVE-2026-85297

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.