{"id":"CVE-2026-109391","revision":"f3ca4492b4af42d1b0f42ed52188545e","records":[{"revision":"f3ca4492b4af42d1b0f42ed52188545e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-109391","aliases":[],"title":"Square Squash through commit e73f280 Unauthenticated YAML Deserialization via Symbolication API","description":"Square Squash through commit e73f280 contains an insecure deserialization vulnerability that allows unauthenticated attackers to store crafted YAML via the POST /api/1.0/symbolication endpoint. When occurrences referencing the attacker-controlled symbolication UUID are symbolicated, the stored values are passed to YAML.load with SafeYAML in unsafe mode, enabling arbitrary Ruby object deserialization and potential code execution.","state":0,"publishedAt":"2026-10-12T15:16:39.257+00:00","modifiedAt":"2026-10-13T16:57:23.986+00:00","affected":[{"ecosystem":"Vendor product","name":"Squash","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Square\",\n                    \"product\": \"Squash\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"lessThanOrEqual\": \"e73f2805f9eb30780a5c213b001f0f4255660fbf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ],\n                    \"packageURL\": \"pkg:github/SquareSquash/web\",\n                    \"repo\": \"https://github.com/SquareSquash/web\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":9.2,"severity":"CRITICAL"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.1,"severity":"HIGH"}],"references":["https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/HJ87QX5ifg","https://github.com/SquareSquash/web/blob/e73f2805f9eb30780a5c213b001f0f4255660fbf/app/controllers/api/v1_controller.rb","https://github.com/SquareSquash/web/blob/e73f2805f9eb30780a5c213b001f0f4255660fbf/config/preinitializers/safe_yaml.rb","https://github.com/SquareSquash/web/blob/e73f2805f9eb30780a5c213b001f0f4255660fbf/lib/workers/symbolication_creator.rb","https://github.com/SquareSquash/web/blob/e73f2805f9eb30780a5c213b001f0f4255660fbf/app/models/symbolication.rb","https://github.com/SquareSquash/web","https://www.vulncheck.com/advisories/square-squash-through-commit-e73f280-unauthenticated-yaml-deserialization-via-symbolication-api"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-109391","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-109391","identifiers":["CVE-2026-109391"]},"retained":false,"historicalAffected":[]}],"coverage":[]}