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CVE-2026-74837— Unbounded atom creation from client-supplied RPC field names in AshTypescript field formatter

Quick assessment

Affected
ash-project ash_typescript
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

以下是该漏洞描述的中文翻译： 资源分配无限制或无流控漏洞 ash-project 中的 ash_typescript 存在“资源分配无限制或无流控”漏洞。未认证的 attackers（攻击者）可以通过客户端提供的 RPC 字段名来耗尽 BEAM 原子（atom）表，从而导致节点中止（abort）。 技术细节： （位于 ）在不存在匹配的原子时，会通过 将客户端提供的字段名转换为原子。该函数首先委托给 ，后者使用 解析名称，若未找到已有原子则回退返回原始字符串；随后 会基于该字符串创建（mint）一个新的原子，而不是将

CVSS 8.7 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-74837

Vulnerability Information
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Vulnerability Title
Unbounded atom creation from client-supplied RPC field names in AshTypescript field formatter
Source: CVE Program / CVE List V5
Vulnerability 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 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ash-project ash_typescript 0.1.0 ~ 0.18.0 cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*
ash-project ash_typescript 1a3d4c343430c8e4784acfcd33122a807fafa086 ~ df95df4b9afdca5e5bbce32dbd566ccc49a7f14b cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-74837

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III. Intelligence Information for CVE-2026-74837

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Patches & Fixes for CVE-2026-74837 (1)

Vendor Advisories for CVE-2026-74837 (3)

Same Patch Batch · ash-project · 2026-09-01 · 23 CVEs total

CVE-2026-77856 8.2 HIGH Unbounded atom creation from typed struct field names in AshTypescript field selector
CVE-2026-82730 8.2 HIGH Authorization-redacted field values disclosed through AshTypescript result normalization
CVE-2026-77950 6.3 MEDIUM RPC error handler fails open in AshTypescript, disclosing unredacted errors
CVE-2026-82732 6.3 MEDIUM Declared argument constraints not enforced on AshTypescript typed controller routes
CVE-2026-82733 6.3 MEDIUM Route handler return value echoed into AshTypescript error response
CVE-2026-82738 5.9 MEDIUM Ash.Type.UUIDv7 accepts non-v7 UUIDs that then fail to load, causing persistent denial of
CVE-2026-82735 5.9 MEDIUM Match regex runs on over-length input in Ash.Type.String, enabling regex denial of service
CVE-2026-82737 5.9 MEDIUM Ash.Vector wraps the 16-bit dimension header for vectors over 65,535 elements, corrupting
CVE-2026-82747 5.9 MEDIUM Ash.Policy.Authorizer returns records denied by a runtime read policy to any actor
CVE-2026-82742 5.9 MEDIUM Ash.Filter.Runtime materializes a combinatorial cross-product over to-many relationships,
CVE-2026-82745 5.9 MEDIUM ETS and Mnesia data layers overwrite an existing record on create instead of enforcing pri
CVE-2026-82746 5.9 MEDIUM Ash.update_many/4 atomic path skips resource policy authorization, allowing updates to for
CVE-2026-82749 5.9 MEDIUM Ash relationship parent(...) filter degrades to an IS NULL match when the parent field is
CVE-2026-82731 2.3 LOW Unescaped path parameters in AshTypescript generated TypeScript client allow request redir
CVE-2026-82740 2.1 LOW Ash.Type ignores outer array constraints on nested {:array, {:array, type}} inputs
CVE-2026-82739 2.1 LOW Ash.Resource.Validation.Confirm leaks a confirmed field's stored value in the atomic misma
CVE-2026-82741 2.1 LOW Ash.Type.Union with :map_with_tag does not force the tag on dump, enabling tag confusion
CVE-2026-82736 2.1 LOW Ash.Type.CiString validates length and match constraints before case folding, allowing con
CVE-2026-82743 2.1 LOW Ash.Actions.Read.AsyncLimiter busy-spins a scheduler while awaiting slow async reads
CVE-2026-82734 2.1 LOW Non-finite Infinity/NaN decimal values bypass bounds constraints in Ash.Type.Decimal

Showing top 20 of 23 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: ash_typescript
Same vendor: ash-project
Same weakness: CWE-770

V. Comments for CVE-2026-74837

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