{"id":"EEF-CVE-2026-74837","summary":"Unbounded atom creation from client-supplied RPC field names in AshTypescript field formatter","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 RPC field names.\n\n`AshTypescript.FieldFormatter.convert_to_field_atom/2` in `lib/ash_typescript/field_formatter.ex` converts a client-supplied field name to an atom with `String.to_atom/1` when no matching atom already exists. It delegates first to `parse_input_field/2`, which resolves the name with `String.to_existing_atom/1` and falls back to returning the plain string; `convert_to_field_atom/2` then mints an atom from that string rather than treating the name as unknown.\n\nRPC field selection reaches it for every requested field name through `AshTypescript.Rpc.FieldProcessing.FieldSelector`, which resolves each name before checking that the field exists, with no allowlist, length bound, or rate limit. Atoms are never garbage collected, so each distinct name mints a permanent one and the VM aborts once the atom table limit is reached. A field name over 255 characters additionally raises an uncaught `SystemLimitError`.\n\nThis issue affects ash_typescript: from 0.1.0 before 0.18.0.\n\n## Configurations\n\nThe application exposes an AshTypescript RPC endpoint over HTTP, so that client-supplied field names reach `AshTypescript.Rpc.run_action/3`.","aliases":["CVE-2026-74837","GHSA-mhxc-mhqx-3v28"],"modified":"2026-09-08T03:45:06.157473147Z","published":"2026-09-01T02:09:30.790Z","database_specific":{"capec_ids":["CAPEC-130"],"cpe_ids":["cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-770"]},"references":[{"type":"ADVISORY","url":"https://github.com/ash-project/ash_typescript/security/advisories/GHSA-mhxc-mhqx-3v28"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-74837.html"},{"type":"FIX","url":"https://github.com/ash-project/ash_typescript/commit/df95df4b9afdca5e5bbce32dbd566ccc49a7f14b"},{"type":"PACKAGE","url":"https://hex.pm/packages/ash_typescript"}],"affected":[{"package":{"name":"ash_typescript","ecosystem":"Hex","purl":"pkg:hex/ash_typescript"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.1.0"},{"fixed":"0.18.0"}]}],"versions":["0.1.0","0.1.2","0.10.0","0.10.1","0.10.2","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","0.2.0","0.3.1","0.3.2","0.3.3","0.4.0","0.5.0","0.6.0","0.6.1","0.6.2","0.6.3","0.6.4","0.7.0","0.7.1","0.8.0","0.8.1","0.8.2","0.8.3","0.8.4","0.9.0","0.9.1"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-74837.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/ash-project/ash_typescript","events":[{"introduced":"1a3d4c343430c8e4784acfcd33122a807fafa086"},{"fixed":"df95df4b9afdca5e5bbce32dbd566ccc49a7f14b"}]}],"versions":["v0.15.0","v0.15.3","v0.15.2","v0.15.1","v0.14.4","v0.14.3","v0.14.2","v0.14.1","v0.14.0","v0.13.2","v0.13.1","v0.13.0","v0.12.1","v0.12.0","v0.11.6","v0.11.5","v0.11.4","v0.11.3","v0.11.2","v0.11.1","v0.11.0","v0.10.2","v0.10.1","v0.10.0","v0.9.1","v0.9.0","v0.8.4","v0.8.3","v0.8.2","v0.8.1","v0.8.0","v0.7.1","v0.6.4","v0.6.3","v0.6.2","v0.6.1","v0.6.0","v0.5.0","v0.4.0","v0.3.3","v0.3.2","v0.3.1","v0.3.0","v0.2.0","v0.1.2","v0.1.1","v0.1.0"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-74837.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}],"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"}]}