CVE-2026-12537: Unauthenticated Remote Code Execution in Gemini CLI CI/CD Workflows
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
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.
Description quoted from the CVE record (assigned by GoogleCloud, published 2026-06-24).
Weakness: CWE-20 Improper Input Validation
How it can be exploited
Exploitable over the network with low attack complexity with no special attack requirements needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. 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
CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: yes. Technical impact: total.
Public exploit evidence (Exploit Observer)
Also known as: EUVD-2026-38790, GHSA-jj69-4grx-fqj5, GHSA-wpqr-6v78-jr5g
Exploit Observer has no public exploit code that names this CVE or one of its aliases.
Vulnerability databases and vendor advisories (5)
Catalogue entries, not exploit evidence.
- Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2026-38790
- Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-jj69-4grx-fqj5
- Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-wpqr-6v78-jr5g
- Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-12537
- Vulnerability database or vendor advisory: https://osv.dev/vulnerability/GHSA-wpqr-6v78-jr5g
2 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.
VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.
Live scores
- EPSS
- 0.002
low predicted chance of attack - VEDAS
- 0.183
little exploit evidence - On CISA KEV
- Not listed
- Detection rule
- None yet
Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish.
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| Google Cloud Gemini CLI | before 0.39.1 | Not stated |
| Google Cloud run-gemini-cli GitHub Action | before 0.1.22 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
Exploit Observer also maps it to: google gemini-cli, google run-gemini-cli.
How to fix it
Fixed versions stated in the CVE record: 0.39.1, 0.1.22.
How to detect it
There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.
Advisories on this CVE
- AI coding agents in CI: one GitHub issue can reach your secrets (full advisory)
- AI coding agents in CI: one GitHub issue reaches secrets (Novee, Black Hat USA, 5 Aug 2026) (5 Aug 2026)
References
Other references
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.