{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55787","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-17T14:40:28.380Z","datePublished":"2026-10-14T18:13:52.454Z","dateUpdated":"2026-10-15T14:55:23.673Z"},"containers":{"cna":{"title":"Flyto2 Core: SSRF guard bypass via IPv6 transition addresses (IPv4-mapped / 6to4 / NAT64) in validate_url_ssrf","problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/flytohub/flyto-core/security/advisories/GHSA-794r-5rp2-fpg8","tags":["x_refsource_CONFIRM"],"url":"https://github.com/flytohub/flyto-core/security/advisories/GHSA-794r-5rp2-fpg8"},{"name":"https://github.com/flytohub/flyto-core/pull/20","tags":["x_refsource_MISC"],"url":"https://github.com/flytohub/flyto-core/pull/20"},{"name":"https://github.com/flytohub/flyto-core/commit/519e040384a74984848c4e84a6600e5f1020a6d2","tags":["x_refsource_MISC"],"url":"https://github.com/flytohub/flyto-core/commit/519e040384a74984848c4e84a6600e5f1020a6d2"},{"name":"https://github.com/flytohub/flyto-core/releases/tag/v2.26.3","tags":["x_refsource_MISC"],"url":"https://github.com/flytohub/flyto-core/releases/tag/v2.26.3"}],"affected":[{"vendor":"flytohub","product":"flyto-core","versions":[{"version":"< 2.26.3","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-10-14T18:13:52.454Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-794r-5rp2-fpg8","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/flytohub/flyto-core/security/advisories/GHSA-794r-5rp2-fpg8","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-15T14:54:19.186468Z","id":"CVE-2026-55787","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-10-15T14:55:23.673Z"}}]}}