{"affected":[{"package":{"ecosystem":"Hex","name":"ash_typescript","purl":"pkg:hex/ash_typescript"},"ranges":[{"events":[{"introduced":"0.11.0"},{"fixed":"0.18.0"}],"type":"SEMVER"}],"versions":["0.11.0","0.11.1","0.11.2","0.11.3","0.11.4","0.11.5","0.11.6","0.12.0","0.12.1","0.13.0","0.13.1","0.13.2","0.14.0","0.14.1","0.14.2","0.14.3","0.14.4","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":"7c3d30896f2f9a54edea17e3787549776b1b288d"},{"fixed":"0ab5c83a7df28d51a6de1fb9b859a142b2b12919"}],"repo":"https://github.com/ash-project/ash_typescript","type":"GIT"}]}],"aliases":["GHSA-rj47-h936-4cxw","CVE-2026-77856"],"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-130"],"cpe_ids":["cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-770"]},"details":"## Summary\n\nAllocation of Resources Without Limits or Throttling vulnerability in ash-project ash\\_typescript allows an unauthenticated attacker to exhaust the BEAM atom table and abort the node via client-supplied typed struct field names.\n\nresolve\\_typed\\_struct\\_field/2 in lib/ash\\_typescript/rpc/field\\_processing/field\\_selector.ex looks a client-supplied field name up in the typed struct's reverse map and, when it finds no match, falls back to String.to\\_atom/1. Because this runs before any field-existence check, an unresolvable name mints a permanent atom rather than being rejected as unknown. Atoms are never garbage collected, so a request carrying many distinct names on a typed struct field grows the atom table until the VM aborts at its limit.\n\nThis issue affects ash\\_typescript: from 0.11.0 before 0.18.0.\n\n## Configuration\n\nThe application exposes an AshTypescript RPC endpoint over HTTP and has at least one resource field backed by an Ash.TypedStruct, so that client-supplied names reach resolve\\_typed\\_struct\\_field/2.","id":"EEF-CVE-2026-77856","modified":"2026-09-01T02:08:46.512905Z","published":"2026-09-01T02:08:46.189Z","references":[{"type":"ADVISORY","url":"https://github.com/ash-project/ash_typescript/security/advisories/GHSA-rj47-h936-4cxw"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-77856.html"},{"type":"FIX","url":"https://github.com/ash-project/ash_typescript/commit/0ab5c83a7df28d51a6de1fb9b859a142b2b12919"},{"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:N/VA:H/SC:N/SI:N/SA:N","type":"CVSS_V4"}],"summary":"Unbounded atom creation from typed struct field names in AshTypescript field selector","upstream":[]}