EEF-CVE-2026-77856
- Source
- https://cna.erlef.org/osv/EEF-CVE-2026-77856.html
- Import Source
- https://cna.erlef.org/osv/EEF-CVE-2026-77856.json
- JSON Data
- https://api.osv.dev/v1/vulns/EEF-CVE-2026-77856
- Aliases
-
- CVE-2026-77856
- GHSA-rj47-h936-4cxw
- Published
- 2026-09-01T02:08:46.189Z
- Modified
- 2026-09-01T02:25:36.304790618Z
- Severity
-
- 8.2 (High) CVSS_V4 - 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 CVSS Calculator
- Summary
- Unbounded atom creation from typed struct field names in AshTypescript field selector
- Details
-
Summary
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.
Configuration
The 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.
- Database specific
{ "cwe_ids": [ "CWE-770" ], "capec_ids": [ "CAPEC-130" ], "cpe_ids": [ "cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*" ] }- References
- Credits
-
-
- Peter Ullrich - FINDER
-
- Peter Ullrich - REPORTER
-
- Torkild Gundersen Kjevik / Ash Project - REMEDIATION_DEVELOPER
-
- Jonatan Männchen / EEF - COORDINATOR
-
Affected packages
Hex / ash_typescript
Package
- Name
- ash_typescript
- Purl
- pkg:hex/ash_typescript