Vulnerability in Tailcallhq Forgecode
CVE-2026-57860
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (8.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 8.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Tailcallhq Forgecode — versions 2.11.1
Weakness classification (CWE)
References
- github.com/tailcallhq/forgecode/issues/3022 (issue-tracking)
- github.com/tailcallhq/forgecode/issues/3252 (issue-tracking)
- github.com/tailcallhq/forgecode (product)
- github.com/tailcallhq/forgecode/commit/68ca3a3a26c73c38a700453d3d021b5bbdc15dbd (patch)
- www.vulncheck.com/advisories/forgecode-arbitrary-code-execution-via-unvetted-mc… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-57860?
- CVE-2026-57860 is a high-severity vulnerability in Tailcallhq Forgecode, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 7.8/10. Published 2026-07-17.
- How severe is CVE-2026-57860?
- High severity. CVSS v3 base score is 7.8 out of 10.