Unbounded atom creation from client-supplied RPC field names in AshTypescript field formatter
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-770.
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 RPC field names. 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. RPC 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. This issue affects ash_typescript: from 0.1.0 before 0.18.0.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| ash-project | ash_typescript | 0.1.0 to before 0.18.0 | 0.18.0 | Patch available | CNA |
- ash_typescript Vendorash-project Affected 0.1.0 to before 0.18.0 Fixed in 0.18.0 Patch available CNA
CPE names CNA · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:* | — | — | — |
- cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:* Versions — — ·—
Remediation
- Fix · CNA ash_typescript (ash-project) Fixed in 0.18.0
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
ash-project ash_typescript 0.18.0
7 records Highest priority Priority HIGH 3 HIGH, 4 MEDIUM
Other records, highest priority first
- TI-2026-57048 Authorization-redacted field values disclosed through AshTypescript result normalizationPriority HIGH 69
- TI-2026-54210 Unbounded atom creation from typed struct field names in AshTypescript field selectorPriority HIGH 69
- TI-2026-57051 Route handler return value echoed into AshTypescript error responsePriority MEDIUM 61
Timeline
- 2026-10-02 Threatist record created from CVE-2026-74837
References
More ash-project vulnerabilities
- TI-2026-56298 Query-complexity limit bypass via first/last pagination arguments in AshGraphql enables denial of service CVSS 4.0HIGH 8.7
- TI-2026-57010 Path traversal in AshAdmin file uploads via unsanitized client filename CVSS 4.0HIGH 8.3
- TI-2026-26840 Ash Framework: Ash.Type.Module.cast_input/2 atom exhaustion via unchecked Module.concat allows BEAM VM crash CVSS 4.0HIGH 8.2
- TI-2026-54252 EEx template evaluation of prompt content in AshAi enables remote code execution CVSS 4.0HIGH 8.9
- TI-2026-54208 Stored XSS in AshAdmin relationship typeahead via unescaped label_field content CVSS 4.0HIGH 8.4
- TI-2026-56295 Unhandled KeyError in AshGraphql relay node resolution crashes queries via an unknown type segment CVSS 4.0MEDIUM 6.9
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences