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CVE-2026-82743— Ash.Actions.Read.AsyncLimiter busy-spins a scheduler while awaiting slow async reads

Quick assessment

Affected
ash-project ash
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 项目中存在一个不可控资源消耗漏洞：当一个缓慢的异步读取操作正在进行时，框架在等待期间会让一个调度器线程以 100% CPU 利用率空转。 漏洞细节： （位于 ）原本通过在一个紧密循环中对每个并发的异步读取任务调用 来进行轮询等待，而不是阻塞等待。当所有未完成的任务（例如缓慢的关联数据加载或计算）仍在运行时，该循环会立即返回并反复执行，导致持续忙等待（busy-spinning），在缓慢读取的整个持续期间占用一个 BEAM 调度器的全部 CPU 资源；并发的缓慢读取还会占用更多的调度器。 修复方案： 修复后的

CVSS 2.1 · Low
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I. Basic Information for CVE-2026-82743

Vulnerability Information
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Vulnerability Title
Ash.Actions.Read.AsyncLimiter busy-spins a scheduler while awaiting slow async reads
Source: CVE Program / CVE List V5
Vulnerability Description
Uncontrolled Resource Consumption vulnerability in ash-project ash lets a slow asynchronous read spin a scheduler thread at full CPU while the framework waits for it. Ash.Actions.Read.AsyncLimiter.await_at_least_one/1 (lib/ash/actions/read/async_limiter.ex) waited for concurrent async read tasks by polling each with Task.yield(task, 0) in a tight loop rather than blocking. While every outstanding task is still running (a slow related-data load or calculation), the loop returns immediately and repeats, busy-spinning and holding a BEAM scheduler at full CPU for the whole duration of the slow read; concurrent slow reads tie up further schedulers. The fix waits with Task.yield_many (a non-blocking sweep followed by a blocking wait with timeout: :infinity), so the process sleeps until a task completes instead of spinning. This issue affects ash: from 2.19.0 before 3.32.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ash-project ash 2.19.0 ~ 3.32.2 cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*
ash-project ash c48cb08026cf56b1ac33209203bc9c00061b40b8 ~ 0a5ecd2ffdfa848afdeb8827f02982ef2a63a1cd cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-82743

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III. Intelligence Information for CVE-2026-82743

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Other References for CVE-2026-82743 (4)

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-2026-77856 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-2026-82737 5.9 MEDIUM Ash.Vector wraps the 16-bit dimension header for vectors over 65,535 elements, corrupting
CVE-2026-82735 5.9 MEDIUM Match regex runs on over-length input in Ash.Type.String, enabling regex denial of service
CVE-2026-82747 5.9 MEDIUM Ash.Policy.Authorizer returns records denied by a runtime read policy to any actor
CVE-2026-82738 5.9 MEDIUM Ash.Type.UUIDv7 accepts non-v7 UUIDs that then fail to load, causing persistent denial of
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-2026-82739 2.1 LOW Ash.Resource.Validation.Confirm leaks a confirmed field's stored value in the atomic misma
CVE-2026-82740 2.1 LOW Ash.Type ignores outer array constraints on nested {:array, {:array, type}} inputs
CVE-2026-82736 2.1 LOW Ash.Type.CiString validates length and match constraints before case folding, allowing con
CVE-2026-82741 2.1 LOW Ash.Type.Union with :map_with_tag does not force the tag on dump, enabling tag confusion
CVE-2026-82734 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
Same vendor: ash-project
Same weakness: CWE-400

V. Comments for CVE-2026-82743

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