ash-project ash 2.19.0/3.32.1 AsyncLimiter async_limiter.ex Ash.Actions.Read.AsyncLimiter.await_at_least_one resource consumption

Summaryinfo

A vulnerability identified as problematic has been detected in ash-project ash 2.19.0/3.32.1. The impacted element is the function Ash.Actions.Read.AsyncLimiter.await_at_least_one of the file lib/ash/actions/read/async_limiter.ex of the component AsyncLimiter. This manipulation causes resource consumption. This vulnerability is registered as CVE-2026-82743. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability has been found in ash-project ash 2.19.0/3.32.1 and classified as problematic. Affected by this vulnerability is the function Ash.Actions.Read.AsyncLimiter.await_at_least_one of the file lib/ash/actions/read/async_limiter.ex of the component AsyncLimiter. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-82743 since 08/31/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 3.32.2 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• ash-project

Name

• ash

Version

• 2.19.0
• 3.32.1

Website

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

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