Vulnerability-Lookup

GHSA-2255-3477-VP73

Vulnerability from github – Published: 2026-09-10 09:31 – Updated: 2026-09-23 12:31

Details

A vulnerability in the Gemini CLI and associated GitHub Action allowed an unprivileged attacker to achieve an arbitrary code execution in Gemini CLI via untrusted local .env files overriding GEMINI_CLI_HOME.

Severity

9.2 (Critical)


                  
                    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/U:Amber

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-13745"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-15",
      "CWE-20"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-10T09:17:00Z",
    "severity": "CRITICAL"
  },
  "details": "A vulnerability in the Gemini CLI and associated GitHub Action allowed an unprivileged attacker\u00a0to achieve an arbitrary code execution in Gemini CLI via untrusted local .env files overriding GEMINI_CLI_HOME.",
  "id": "GHSA-2255-3477-vp73",
  "modified": "2026-09-23T12:31:07Z",
  "published": "2026-09-10T09:31:33Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/google-github-actions/run-gemini-cli/security/advisories/GHSA-wpqr-6v78-jr5g"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-13745"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google-gemini/gemini-cli/releases/tag/v0.39.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google-github-actions/run-gemini-cli/releases/tag/v0.1.22"
    },
    {
      "type": "WEB",
      "url": "https://www.pwned.info/articles/homing-in-on-arbitrary-code-execution-within-gemini-cli"
    },
    {
      "type": "WEB",
      "url": "https://www.redguard.ch/blog/2026/06/03/advisory-google-gemini-cli"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-13745 (GCVE-0-2026-13745)

Vulnerability from cvelistv5 – Published: 2026-09-10 08:33 – Updated: 2026-09-23 09:48

Title

Arbitrary Code Execution in Gemini CLI via Untrusted Local .env Files Overriding GEMINI_CLI_HOME

Summary

A vulnerability in the Gemini CLI prior to version 0.39.1 allows attackers to achieve arbitrary code execution by tricking a victim into starting the CLI within an untrusted directory. The vulnerability is triggered via untrusted .env files overriding GEMINI_CLI_HOME to load malicious configuration files and bypass folder trust prompts.

Severity

7.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/U:Amber

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-10 15:03 UTC

CWE

CWE-829 - Inclusion of functionality from untrusted control sphere
CWE-15 - External Control of System or Configuration Setting

Assigner

GoogleCloud Google root Scorecard

References

3 references

URL	Tags
https://github.com/google-gemini/gemini-cli/relea…
https://www.redguard.ch/blog/2026/06/03/advisory-…
https://www.pwned.info/articles/homing-in-on-arbi…

Impacted products

1 product

Vendor	Product	Version
Google Cloud	Gemini CLI	Affected: 0 , < 0.39.1 (custom)

Credits

Benjamin Faller, Redguard AG

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-13745",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-10T15:03:19.734151Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-10T15:03:41.131Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Gemini CLI",
          "repo": "https://github.com/google-gemini/gemini-cli",
          "vendor": "Google Cloud",
          "versions": [
            {
              "lessThan": "0.39.1",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Benjamin Faller, Redguard AG"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cdiv\u003eA vulnerability in the Gemini CLI prior to version 0.39.1 allows attackers to achieve arbitrary code execution by tricking a victim into starting the CLI within an untrusted directory. The vulnerability is triggered via untrusted .env files overriding GEMINI_CLI_HOME to load malicious configuration files and bypass folder trust prompts.\u003c/div\u003e"
            }
          ],
          "value": "A vulnerability in the Gemini CLI prior to version 0.39.1 allows attackers to achieve arbitrary code execution by tricking a victim into starting the CLI within an untrusted directory. The vulnerability is triggered via untrusted .env files overriding GEMINI_CLI_HOME to load malicious configuration files and bypass folder trust prompts."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-38",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-38 Leveraging/Manipulating Configuration File Search Paths"
            }
          ]
        },
        {
          "capecId": "CAPEC-13",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-13 Subverting Environment Variable Values"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 7.7,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "AMBER",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/U:Amber",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-829",
              "description": "CWE-829 Inclusion of functionality from untrusted control sphere",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-15",
              "description": "CWE-15 External Control of System or Configuration Setting",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-23T09:48:39.517Z",
        "orgId": "f45cbf4e-4146-4068-b7e1-655ffc2c548c",
        "shortName": "GoogleCloud"
      },
      "references": [
        {
          "url": "https://github.com/google-gemini/gemini-cli/releases/tag/v0.39.1"
        },
        {
          "url": "https://www.redguard.ch/blog/2026/06/03/advisory-google-gemini-cli/"
        },
        {
          "url": "https://www.pwned.info/articles/homing-in-on-arbitrary-code-execution-within-gemini-cli/"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cdiv\u003e\u003col\u003e\u003cli\u003e\u003cstrong\u003eUpgrade\u003c/strong\u003e: 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\u003c/li\u003e\u003cli\u003e\u003cstrong\u003eConfigure Trust\u003c/strong\u003e: Determine if your CI workflow operates on trusted or untrusted data. If the data is fully trusted, set\u0026nbsp;\u003ccode\u003eGEMINI_TRUST_WORKSPACE: \u0027true\u0027\u003c/code\u003e\u0026nbsp;in your workflow.\u003c/li\u003e\u003c/ol\u003e\u003c/div\u003e"
            }
          ],
          "value": "*  Upgrade: 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\n  *  Configure Trust: Determine if your CI workflow operates on trusted or untrusted data. If the data is fully trusted, set GEMINI_TRUST_WORKSPACE: \u0027true\u0027 in your workflow."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Arbitrary Code Execution in Gemini CLI via Untrusted Local .env Files Overriding GEMINI_CLI_HOME",
      "x_generator": {
        "engine": "Vulnogram 1.0.2"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f45cbf4e-4146-4068-b7e1-655ffc2c548c",
    "assignerShortName": "GoogleCloud",
    "cveId": "CVE-2026-13745",
    "datePublished": "2026-09-10T08:33:09.309Z",
    "dateReserved": "2026-06-29T15:39:28.269Z",
    "dateUpdated": "2026-09-23T09:48:39.517Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

GHSA-2255-3477-VP73

CVE-2026-13745 (GCVE-0-2026-13745)

Tags

Sightings

Nomenclature

Related by attack behaviour