Review reviewCritical

CVE-2026-12537

Google Cloud Gemini CLI, run-gemini-cli GitHub Action, gemini-cli

Improper Neutralization used in an OS Command in the container launcher in Google Gemini CLI (versions prior to 0.39.1) and run-gemini-cli GitHub Action (versions prior to 0.1.22) on headless CI platforms allows an unprivileged attacker to achieve pre-sandbox host-level code execution a maliciously crafted .gemini/.env file.

CVSS: 10
EPSS: 0.15%
CISA KEV: Not listed
Published: 2026.06.24

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.15%

Technical severityCVSS 10

Vulnerability overview

Affected product and versions

Product: Google Cloud Gemini CLI, run-gemini-cli GitHub Action, gemini-cli
Affected versions: < 0.39.1, 0.40.0, < 0.1.22
Fixed versions: 0.39.1, 0.1.22

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Google Cloud Gemini CLI, run-gemini-cli GitHub Action, gemini-cli and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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:Clear
CWE: CWE-20, CWE-78