{"id":"CVE-2026-55786","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-55786","generatedAt":"2026-10-28T00:52:45.771Z","title":"Flyto2 Core is an execution kernel for automation and AI-agent workflows.","description":"Flyto2 Core is an execution kernel for automation and AI-agent workflows. From 2.26.2 until 2.26.4, the HTTP MCP POST /mcp route accepts unauthenticated JSON-RPC tools/call requests and forwards execute_module arguments to the module registry without the require_auth dependency used by the REST execution routes. An unauthenticated caller can select sandbox.execute_shell and supply its command parameter, which reaches asyncio.create_subprocess_shell with the privileges of the flyto-core server process. The endpoint is reachable locally under the default loopback binding and becomes network reachable when an operator binds the server to a non-loopback interface, allowing arbitrary OS command execution and potential full host compromise. This issue is fixed in version 2.26.4.","published":"2026-10-14T19:17:18.000Z","lastModified":"2026-10-16T20:04:30.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":8.4,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-78","CWE-306"],"affected":[],"epss":{"score":0.00256,"percentile":0.17051,"date":"2026-10-26","history":[{"date":"2026-10-15","score":0.00256,"percentile":0.16027}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-14T19:17:18.000Z","detail":{"score":"8.4","severity":"HIGH","publishedAt":"2026-10-14T19:17:17.777Z"},"summary":"New CVE, high severity (CVSS 8.4)."}],"references":[{"url":"https://github.com/flytohub/flyto-core/commit/db7f116b1d3c5dcf94aded00d14118f81f3e225e","source":"security-advisories@github.com"},{"url":"https://github.com/flytohub/flyto-core/releases/tag/v2.26.4","source":"security-advisories@github.com"},{"url":"https://github.com/flytohub/flyto-core/security/advisories/GHSA-h9f9-h6gm-wc85","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-55786","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}