ash-project ash_typescript up to 0.17.x field_selector.ex resolve_typed_struct_field allocation of resources

Summaryinfo

A vulnerability was found in ash-project ash_typescript up to 0.17.x. It has been declared as problematic. Affected by this issue is the function resolve_typed_struct_field of the file lib/ash_typescript/rpc/field_processing/field_selector.ex. Such manipulation leads to allocation of resources. This vulnerability is listed as CVE-2026-77856. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in ash-project ash_typescript up to 0.17.x and classified as problematic. Affected by this issue is the function resolve_typed_struct_field of the file lib/ash_typescript/rpc/field_processing/field_selector.ex. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-77856 since 08/30/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 0.18.0 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• ash-project

Name

• ash_typescript

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17

Website

• Product: https://github.com/ash-project/ash_typescript/

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