CVE-2026-77856 - Unbounded atom creation from typed struct field names in AshTypescript field selector

CVE-2026-77856 - Unbounded atom creation from typed struct field names in AshTypescript field selector

https://cvefeed.io/rssfeed/latest.atom / Tue, 09/01/2026 - 07:29
CVE ID :CVE-2026-77856
Published : Sept. 1, 2026, 3:16 a.m. | 1 hour, 15 minutes ago
Description :Allocation 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. resolve_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. This issue affects ash_typescript: from 0.11.0 before 0.18.0.
Severity: 8.2 | HIGH
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