TI-2026-57061 Aliases CVE-2026-82743

Ash.Actions.Read.AsyncLimiter busy-spins a scheduler while awaiting slow async reads

MEDIUM 44CWE-400Published 2026-09-01 · Updated 2026-09-01

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · Low
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-400.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.0018 7th percentileScored 2026-11-07

Fix Fixed ash (ash-project): 3.32.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
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	2.19.0 to before 3.32.2	3.32.2	Patch available	CNA

ash Vendorash-project Affected 2.19.0 to before 3.32.2 Fixed in 3.32.2 Patch available CNA

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:ash-project:ash::::::::	—	—	—

cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:* Versions — — ·—

Remediation

Fix · CNA ash (ash-project) Fixed in 3.32.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-09-01
ash-project ash 3.32.2
16 records Highest priority Priority MEDIUM 15 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2026-57067 Incorrect authorization in ash-project ashPriority MEDIUM 60
- TI-2026-57065 Ash.Policy.Authorizer returns records denied by a runtime read policy to any actorPriority MEDIUM 60
- TI-2026-57064 Ash.update_many/4 atomic path skips resource policy authorization, allowing updates to forbidden recordsPriority MEDIUM 60
Show all 16 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-82743

References

Patch 1

https://github.com/ash-project/ash/commit/0a5ecd2ffdfa848afdeb8827f02982ef2a63a1cd

Advisory 1

https://github.com/ash-project/ash/security/advisories/GHSA-33wq-x3q2-c92h

Other 2

TI-2026-56298 Query-complexity limit bypass via first/last pagination arguments in AshGraphql enables denial of service CVSS 4.0HIGH 8.7
TI-2026-52572 Unbounded atom creation from client-supplied RPC field names in AshTypescript field formatter 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

See all 90 →

Sources

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