{"id":"CVE-2026-57860","summary":"ForgeCode Arbitrary Code Execution via Unvetted .mcp.json in Untrusted Repository","details":"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.","modified":"2026-08-12T03:51:31.252214349Z","published":"2026-07-17T16:16:09.573Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-829"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57860.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57860.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57860"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/forgecode-arbitrary-code-execution-via-unvetted-mcp-json-in-untrusted-repository"},{"type":"REPORT","url":"https://github.com/tailcallhq/forgecode/issues/3022"},{"type":"REPORT","url":"https://github.com/tailcallhq/forgecode/issues/3252"},{"type":"FIX","url":"https://github.com/tailcallhq/forgecode/commit/68ca3a3a26c73c38a700453d3d021b5bbdc15dbd"},{"type":"PACKAGE","url":"https://github.com/tailcallhq/forgecode"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/tailcallhq/forgecode","events":[{"introduced":"68b863c6b9fe38aea5ab7e1375100014c17389ab"},{"fixed":"68ca3a3a26c73c38a700453d3d021b5bbdc15dbd"}],"database_specific":{"extracted_events":[{"introduced":"2.11.1"},{"last_affected":"2.11.1"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["2.11.1","v2.12.16","v2.12.15","v2.12.14","v2.12.13","v2.12.12","v2.12.11","v2.12.10","v2.12.9","v2.12.8","v2.12.7","v2.12.6","v2.12.5","v2.12.4","v2.12.3","v2.12.2","v2.12.1","v2.12.0","v2.11.5","v2.11.4","v2.11.3","v2.11.2","v2.11.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-57860.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","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"}]}