CVE-2026-12537 PUBLISHED

Unauthenticated Remote Code Execution in Gemini CLI CI/CD Workflows

Assigner: GoogleCloud
Reserved: 17.06.2026 Published: 24.06.2026 Updated: 24.06.2026

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.

Metrics

CVSS 4.0

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/U:Clear
CVSS Score: 10

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

CVSS 4.0

Product Status

Vendor	Google Cloud
Product	Gemini CLI
Versions	Default: unaffected affected from 0 to 0.39.1 (excl.)

Vendor	Google Cloud
Product	run-gemini-cli GitHub Action
Versions	Default: unaffected affected from 0 to 0.1.22 (excl.)

Solutions

Ensure you are using the latest version of gemini cli and follow the best practices guide https://github.com/google-github-actions/run-gemini-cli/blob/main/docs/trust-guidance.md .

Credits

Elad Meged of Novee Security reporter
Devansh Batham reporter

References

https://github.com/google-github-actions/run-gemini-cli/security/advisories/GHSA-wpqr-6v78-jr5g

Problem Types

CWE-20 Improper Input Validation CWE

Impacts

CAPEC-88 OS Command Injection