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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

Unauthenticated RCE in Code Runner MCP Server HTTP transport (CVE-2026-5029)

Code Runner MCP Server exposes its /mcp JSON-RPC endpoint without authentication on port 3088 when started with --transport http, letting a remote unauthenticated attacker call the run-code tool to execute arbitrary code via child_process.exec() with the server user's privileges. The issue is reported as unfixed and may affect all versions.

Disclosed 12 May 2026 · Record updated 13 September 2026

Impact

Remote unauthenticated attackers can execute arbitrary code with the privileges of the user running the MCP server; no fix available at time of publication.

Our coverage

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-5029