CPU exhaustion via async-read scheduler busy-spin
Published Sep 1, 2026 · Updated Sep 1, 2026
Uncontrolled resource consumption in Ash Framework Ash 2.19.0 through 3.32.1 allows local users to degrade service via slow async reads. Ash.Actions.Read.AsyncLimiter.await_at_least_one/1 polls each unfinished task with Task.yield(task, 0) in a tight loop instead of blocking until one completes. The condition requires concurrent async reads that remain pending; each loop holds one BEAM scheduler at full CPU, and concurrent slow reads tie up additional schedulers.
Summary
What happened
Uncontrolled resource consumption in Ash Framework Ash 2.19.0 through 3.32.1 allows local users to degrade service via slow async reads. Ash.Actions.Read.AsyncLimiter.await_at_least_one/1 polls each unfinished task with Task.yield(task, 0) in a tight loop instead of blocking until one completes. The condition requires concurrent async reads that remain pending; each loop holds one BEAM scheduler at full CPU, and concurrent slow reads tie up additional schedulers.
The record
- CVE
- CVE-2026-82743
- Published
- Sep 1, 2026
- Updated
- Sep 1, 2026
- Vendor
- Ash Framework
- Product
- Ash
- Classifications
- CWE-400, CAPEC-227, T1499.004
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 1, 2026CVE publishedPublication date reported by the CVE source.
- Sep 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.19.0 <3.32.2
- Affected versionversion=c48cb08026cf56b1ac33209203bc9c00061b40b8 <0a5ecd2ffdfa848afdeb8827f02982ef2a63a1cd
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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