How severe is CVE-2026-12537?

CVE-2026-12537 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-12537 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-12537?

CVE-2026-12537 primarily affects Google Gemini-cli. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-12537?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-12537 have an EU (EUVD) identifier?

Yes. CVE-2026-12537 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38790.

When was CVE-2026-12537 published?

CVE-2026-12537 was published on 2026-06-24 and last updated on 2026-07-02.

CVE-2026-12537

CVE-2026-12537 is a high-severity vulnerability in Google Gemini-cli with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v4: 10.0
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38790
Weakness: CWE-78
Affected product: Google Gemini-cli
Published: 2026-06-24
Last modified: 2026-07-02

Description

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.

Frequently asked questions

What is CVE-2026-12537?: 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.
How severe is CVE-2026-12537?: CVE-2026-12537 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-12537 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-12537?: CVE-2026-12537 primarily affects Google Gemini-cli. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-12537?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-12537 have an EU (EUVD) identifier?: Yes. CVE-2026-12537 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38790.
When was CVE-2026-12537 published?: CVE-2026-12537 was published on 2026-06-24 and last updated on 2026-07-02.

References

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

Affected products (3)

cpe:2.3:a:google:gemini-cli:*:*:*:*:*:node.js:*:*
cpe:2.3:a:google:gemini-cli:0.40.0:preview2:*:*:*:node.js:*:*
cpe:2.3:a:google:run-gemini-cli:*:*:*:*:*:*:*:*

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