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CVE-2026-77856— Unbounded atom creation from typed struct field names in AshTypescript field selector

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.

ash-project 的 ash_typescript 中存在“无限制或无节流的资源分配”漏洞，允许未经身份验证的攻击者通过客户端提供的类型化结构体字段名，耗尽 BEAM 原子表，从而导致节点中断。 lib/ash_typescript/rpc/field_processing/field_selector.ex 中的 函数会在类型化结构体的反向映射中查找客户端提供的字段名；若未找到匹配项，则回退到 。由于该操作在任何字段存在性检查之前执行，无法解析的名称会被创建一个永久的原子（atom），而不是被拒绝为未知字段

CVSS 8.2 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-77856

Vulnerability Information
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Vulnerability Title
Unbounded atom creation from typed struct field names in AshTypescript field selector
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 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.
Source: CVE Program / CVE List V5
CVSS Information
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
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 0.11.0 ~ 0.18.0 cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*
ash-project ash_typescript 7c3d30896f2f9a54edea17e3787549776b1b288d ~ 0ab5c83a7df28d51a6de1fb9b859a142b2b12919 cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-77856

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III. Intelligence Information for CVE-2026-77856

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Patches & Fixes for CVE-2026-77856 (1)

Vendor Advisories for CVE-2026-77856 (2)

Other References for CVE-2026-77856 (1)

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

CVE-2026-74837 8.7 HIGH Unbounded atom creation from client-supplied RPC field names in AshTypescript field format
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-2026-77856

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