UI-TARS-desktop @agent-infra MCP Servers Bind Every Interface Without Authentication, Exposing Arbitrary Command Execution
startServer.ts in the mcp-http-server package of UI-TARS-desktop defaulted its listen address to '::' when no host was given, so startSseAndStreamableHttpMcpServer bound the Streamable HTTP and SSE MCP transports to every interface, and its authentication middleware was optional: middlewares are applied only when a caller supplies them. The @agent-infra/mcp-server-commands and @agent-infra/mcp-server-filesystem entry points call startSseAndStreamableHttpMcpServer with a host and port alone and pass no middleware, so neither server required a credential. The commands server exposes a run_command tool that hands its caller-supplied command string to promisify(child_process.exec), so any unauthenticated client able to reach the port could run arbitrary commands as the user running the server, and the filesystem server exposed its file read and write tools on the same terms. The listen default became 127.0.0.1 in commit c2ad42e3eb9b27830db41a3e6f51ca7179d9b168; the package version stayed at 1.2.4 across that change, so the boundary is the commit rather than a release.
CVE-2026-81735
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-81735
UI-TARS-desktop
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/bytedance/UI-TARS-desktop",
"vendor": "bytedance",
"product": "UI-TARS-desktop",
"versions": [
{
"status": "unaffected",
"version": "c2ad42e3eb9b27830db41a3e6f51ca7179d9b168",
"versionType": "git"
},
{
"status": "affected",
"version": "0",
"lessThan": "c2ad42e3eb9b27830db41a3e6f51ca7179d9b168",
"versionType": "git"
}
],
"collectionURL": "https://github.com/bytedance/UI-TARS-desktop",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-81735
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #1505 · Revision 1
- Added to Heist Feed
- Publisher date