PT-2026-60803 · Tailcallhq · Forgecode

Saad Elharaj · CVE-2026-57860 · Published 2026-07-17 · Updated 2026-07-17

Mitre

CVSS v3.1

7.8

High

Base vector

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

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.

Exploit

Fix

Weakness Enumeration

CWE-829

Related Identifiers

CVE-2026-57860

Affected Products

Forgecode

References · 6

• 🔥 https://github.com/tailcallhq/forgecode/issues/3022 · Exploit
• https://github.com/tailcallhq/forgecode/commit/68ca3a3a26c73c38a700453d3d021b5bbdc15dbd · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-57860 · Security Note
• https://github.com/tailcallhq/forgecode/issues/3252 · Note
• https://github.com/tailcallhq/forgecode · Note
• https://vulncheck.com/advisories/forgecode-arbitrary-code-execution-via-unvetted-mcp-json-in-untrusted-repository · Note