{"id":"CVE-2026-55787","revision":"e6f5fa99b03048ab876f89a8095ef094","records":[{"revision":"e6f5fa99b03048ab876f89a8095ef094","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-55787","aliases":[],"title":"Flyto2 Core: SSRF guard bypass via IPv6 transition addresses (IPv4-mapped / 6to4 / NAT64) in validate_url_ssrf","description":"Flyto2 Core is an execution kernel for automation and AI-agent workflows. Prior to 2.26.3, validate_url_ssrf and is_private_ip in src/core/utils.py compare resolved addresses only against native private IPv4 and IPv6 ranges and do not unwrap IPv4-mapped, IPv4-compatible, 6to4, or NAT64 transition addresses. An authenticated workflow author can provide a transition-form literal URL through the Execution API POST /v1/execute route, http.get, or sibling guarded outbound-request modules, causing the guard to accept an address whose embedded IPv4 points to loopback, RFC 1918, or cloud metadata services. On a host that routes the selected transition form, the outbound request reaches the internal destination and returns the response body to the workflow caller, enabling read SSRF and disclosure of internal-service data or cloud credentials. This issue is fixed in version 2.26.3.","state":0,"publishedAt":"2026-10-14T18:13:52.454+00:00","modifiedAt":"2026-10-15T14:55:23.673+00:00","affected":[{"ecosystem":"Vendor product","name":"flyto-core","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"flytohub\",\n                    \"product\": \"flyto-core\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2.26.3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N","score":7.1,"severity":"HIGH"}],"references":["https://github.com/flytohub/flyto-core/security/advisories/GHSA-794r-5rp2-fpg8","https://github.com/flytohub/flyto-core/pull/20","https://github.com/flytohub/flyto-core/commit/519e040384a74984848c4e84a6600e5f1020a6d2","https://github.com/flytohub/flyto-core/releases/tag/v2.26.3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-55787","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-55787","identifiers":["CVE-2026-55787"]},"retained":false,"historicalAffected":[]}],"coverage":[]}