Vulnerability-Lookup

CVE-2026-57860 (GCVE-0-2026-57860)

Vulnerability from cvelistv5 – Published: 2026-07-17 16:16 – Updated: 2026-07-20 17:45

Title

ForgeCode Arbitrary Code Execution via Unvetted .mcp.json in Untrusted Repository

Summary

ForgeCode (tailcallhq/forgecode), an AI pair-programming CLI, automatically loads and executes the MCP servers defined in a repository's .mcp.json file on startup without user confirmation. A malicious repository can supply a crafted .mcp.json whose mcpServers entries specify arbitrary command and args values (for example, command: bash with args: ['-c', 'touch /tmp/pwned']). When a user runs the forge CLI inside a cloned untrusted repository, the specified commands are spawned with the invoking user's privileges, resulting in arbitrary code execution. This provides a reliable initial-access and persistence primitive against developers who evaluate untrusted repositories with ForgeCode.

Severity

8.4 (High)


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

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-17 16:45 UTC

CWE

CWE-829 - Inclusion of Functionality from Untrusted Control Sphere

Assigner

VulnCheck mitre root

References

5 references

URL	Tags
https://github.com/tailcallhq/forgecode/issues/3022	issue-tracking
https://github.com/tailcallhq/forgecode/issues/3252	issue-tracking
https://github.com/tailcallhq/forgecode	product
https://github.com/tailcallhq/forgecode/commit/68…	patch
https://www.vulncheck.com/advisories/forgecode-ar…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
tailcallhq	forgecode	Affected: 2.11.1 (git)	guessed

Date Public

2026-07-17 00:00

Credits

Saad ELHARAJ (SAAITAAMAA)

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-57860

Vulnerability from fkie_nvd - Published: 2026-07-17 17:17 - Updated: 2026-07-17 18:28

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/tailcallhq/forgecode
	disclosure@vulncheck.com	https://github.com/tailcallhq/forgecode/commit/68ca3a3a26c73c38a700453d3d021b5bbdc15dbd
	disclosure@vulncheck.com	https://github.com/tailcallhq/forgecode/issues/3022
	disclosure@vulncheck.com	https://github.com/tailcallhq/forgecode/issues/3252
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/forgecode-arbitrary-code-execution-via-unvetted-mcp-json-in-untrusted-repository
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/tailcallhq/forgecode/issues/3022

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "affected",
          "packageURL": "pkg:npm/forgecode",
          "product": "forgecode",
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    }
  ],
  "id": "CVE-2026-57860",
  "lastModified": "2026-07-17T18:28:39.220",
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          "exploitMaturity": "NOT_DEFINED",
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          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
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          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
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      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-57860",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-17T16:45:24.963875Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-17T17:17:16.777",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/tailcallhq/forgecode"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/tailcallhq/forgecode/commit/68ca3a3a26c73c38a700453d3d021b5bbdc15dbd"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/tailcallhq/forgecode/issues/3022"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/tailcallhq/forgecode/issues/3252"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/forgecode-arbitrary-code-execution-via-unvetted-mcp-json-in-untrusted-repository"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/tailcallhq/forgecode/issues/3022"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-829"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Primary"
    }
  ]
}

GHSA-6P2J-G97C-79WF

Vulnerability from github – Published: 2026-07-17 18:31 – Updated: 2026-07-17 18:31

Details

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

8.4 (High)


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

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-57860"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-829"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-17T17:17:16Z",
    "severity": "HIGH"
  },
  "details": "ForgeCode (tailcallhq/forgecode), an AI pair-programming CLI, automatically loads and executes the MCP servers defined in a repository\u0027s .mcp.json file on startup without user confirmation. A malicious repository can supply a crafted .mcp.json whose mcpServers entries specify arbitrary command and args values (for example, command: bash with args: [\u0027-c\u0027, \u0027touch /tmp/pwned\u0027]). When a user runs the forge CLI inside a cloned untrusted repository, the specified commands are spawned with the invoking user\u0027s privileges, resulting in arbitrary code execution. This provides a reliable initial-access and persistence primitive against developers who evaluate untrusted repositories with ForgeCode.",
  "id": "GHSA-6p2j-g97c-79wf",
  "modified": "2026-07-17T18:31:27Z",
  "published": "2026-07-17T18:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-57860"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tailcallhq/forgecode/issues/3022"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tailcallhq/forgecode/issues/3252"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tailcallhq/forgecode/commit/68ca3a3a26c73c38a700453d3d021b5bbdc15dbd"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tailcallhq/forgecode"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/forgecode-arbitrary-code-execution-via-unvetted-mcp-json-in-untrusted-repository"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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:X",
      "type": "CVSS_V4"
    }
  ]
}

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.

Detection rules are retrieved from Rulezet.

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

CVE-2026-57860 (GCVE-0-2026-57860)

FKIE_CVE-2026-57860

GHSA-6P2J-G97C-79WF

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Related by attack behaviour