{"cve":"CVE-2026-55786","nvd":{"published":"2026-10-14T19:17:17.777","modified":"2026-10-16T20:04:29.760","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.4},"cwes":["CWE-78","CWE-306"],"references":["https://github.com/flytohub/flyto-core/commit/db7f116b1d3c5dcf94aded00d14118f81f3e225e","https://github.com/flytohub/flyto-core/releases/tag/v2.26.4","https://github.com/flytohub/flyto-core/security/advisories/GHSA-h9f9-h6gm-wc85"],"products":[],"source":"nvd","synced_at":"2026-10-19T23:00:53.604569364+00:00"},"epss":{"cve":"CVE-2026-55786","score":0.00256,"percentile":0.17035,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-h9f9-h6gm-wc85","url":"https://osv.dev/vulnerability/GHSA-h9f9-h6gm-wc85","summary":"flyto-core has Unauthenticated Command Execution via HTTP MCP `execute_module`","modified":"2026-10-14T18:30:04.611883374Z","packages":[{"ecosystem":"PyPI","name":"flyto-core","purl":"pkg:pypi/flyto-core","ranges":[">=2.26.2 <2.26.4"],"fixed":["2.26.4"]}]},{"id":"PYSEC-2026-2482","url":"https://osv.dev/vulnerability/PYSEC-2026-2482","summary":"flyto-core has Unauthenticated Command Execution via HTTP MCP `execute_module`","modified":"2026-07-13T16:31:47.496592699Z","packages":[{"ecosystem":"PyPI","name":"flyto-core","purl":"pkg:pypi/flyto-core","ranges":[">=2.26.2 <2.26.4"],"fixed":["2.26.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}