{"affected":[{"package":{"ecosystem":"Hex","name":"ash_typescript","purl":"pkg:hex/ash_typescript"},"ranges":[{"events":[{"introduced":"0.15.0"},{"fixed":"0.18.0"}],"type":"SEMVER"}],"versions":["0.15.0","0.15.1","0.15.2","0.15.3","0.16.0","0.17.0","0.17.1","0.17.2","0.17.3"]},{"ranges":[{"events":[{"introduced":"546a15e1a2d7dbf1df2d5a6ee4404bc3da87852e"},{"fixed":"21ab6f1229a4dccdb56bc37ed437d9672a0c4a4e"}],"repo":"https://github.com/ash-project/ash_typescript","type":"GIT"}]}],"aliases":["GHSA-f7fq-hwq6-jhvv","CVE-2026-82732"],"credits":[{"name":"Peter Ullrich","type":"FINDER"},{"name":"Peter Ullrich","type":"REPORTER"},{"name":"Torkild Gundersen Kjevik / Ash Project","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"COORDINATOR"}],"database_specific":{"capec_ids":["CAPEC-153"],"cpe_ids":["cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-20"]},"details":"## Summary\n\nImproper 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.\n\n## Configuration\n\nThe application exposes an AshTypescript typed controller over HTTP with at least one route argument carrying a constraints declaration that gates application behaviour.","id":"EEF-CVE-2026-82732","modified":"2026-09-01T02:09:15.625290Z","published":"2026-09-01T02:09:15.070Z","references":[{"type":"ADVISORY","url":"https://github.com/ash-project/ash_typescript/security/advisories/GHSA-f7fq-hwq6-jhvv"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-82732.html"},{"type":"FIX","url":"https://github.com/ash-project/ash_typescript/commit/21ab6f1229a4dccdb56bc37ed437d9672a0c4a4e"},{"type":"PACKAGE","url":"https://hex.pm/packages/ash_typescript"}],"related":[],"schema_version":"1.7.3","severity":[{"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","type":"CVSS_V4"}],"summary":"Declared argument constraints not enforced on AshTypescript typed controller routes","upstream":[]}