{"id":"CVE-2026-82732","summary":"Declared argument constraints not enforced on AshTypescript typed controller routes","details":"Improper Input Validation vulnerability in ash-project ash_typescript allows a remote attacker to submit argument values outside a declared allowlist or bound on typed-controller routes.\n\nAshTypescript.TypedController.RequestHandler in lib/ash_typescript/typed_controller/request_handler.ex calls Ash.Type.cast_input/3 and treats an {:ok, cast} result as fully validated. In Ash these are separate steps: cast_input/3 only coerces the term, while every constraint declared on the argument is applied by Ash.Type.apply_constraints/3, which this path never calls. Constraints such as one_of, max_length, min and max, and match are therefore inert, so a value outside a declared allowlist is accepted and passed to the route handler. Codegen renders the same constraints into the generated TypeScript types, so an allowlist appears enforced to a TypeScript caller while any other HTTP client ignores it. Empty-string to nil normalization also lives in apply_constraints, so the allow_nil?: false check accepts \"\" for a required argument.\n\nWhere a constraint gates a role, a status, or a sort direction, this becomes a privilege or state-machine bypass.\n\nThis issue affects ash_typescript: from 0.15.0 before 0.18.0.","aliases":["EEF-CVE-2026-82732","GHSA-f7fq-hwq6-jhvv"],"modified":"2026-09-03T03:30:16.394553372Z","published":"2026-09-01T02:09:15.070Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"546a15e1a2d7dbf1df2d5a6ee4404bc3da87852e"},{"fixed":"21ab6f1229a4dccdb56bc37ed437d9672a0c4a4e"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"EEF","cwe_ids":["CWE-20"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82732.json"},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-82732.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-82732"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82732.json"},{"type":"ADVISORY","url":"https://github.com/ash-project/ash_typescript/security/advisories/GHSA-f7fq-hwq6-jhvv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-82732"},{"type":"FIX","url":"https://github.com/ash-project/ash_typescript/commit/21ab6f1229a4dccdb56bc37ed437d9672a0c4a4e"},{"type":"PACKAGE","url":"https://github.com/ash-project/ash_typescript"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ash-project/ash_typescript","events":[{"introduced":"fb4cc367b85b68d90b99be692dcbbbfc248c1adb"},{"fixed":"808e4b17ee821a8dac98bda5bf01da0fe1b69d41"},{"fixed":"21ab6f1229a4dccdb56bc37ed437d9672a0c4a4e"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"0.15.0"},{"fixed":"0.18.0"}]}}],"versions":["v0.15.0","v0.15.3","v0.15.2","v0.15.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82732.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}]}