High severity · published Sep 1, 2026
CVE-2026-77856
Unbounded atom creation from typed struct field names in AshTypescript field selector
8.2
CVSS
0.5%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
ash_typescript · ash-project
0.11.0 before 0.18.0; 7c3d30896f2f9a54edea17e3787549776b1b288d before 0ab5c83a7df28d51a6de1fb9b859a142b2b12919 · source: vendor
Affected product
AS
ash_typescript
ash-project
More from ash_typescript
8.7
CVE-2026-74837
Unbounded atom creation from client-supplied RPC field names in AshTypescript field formatter
8.2
CVE-2026-82730
Authorization-redacted field values disclosed through AshTypescript result normalization
6.3
CVE-2026-105283
Internal error terms inspected into AshTypescript RPC error responses
6.3
CVE-2026-82733
Route handler return value echoed into AshTypescript error response
6.3
CVE-2026-82732
Declared argument constraints not enforced on AshTypescript typed controller routes