CVE-2026-82579 AshAi tool loop never terminates when all tool calls are filtered out, enabling denial of service
Attackers can trigger an infinite loop in AshAi tool processing by influencing model output, causing unbounded requests and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-82579?
CVE-2026-82579 is a medium-severity denial of service vulnerability in ash-project ash_ai, published on 31 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Loop with Unreachable Exit Condition (Infinite Loop) vulnerability in ash-project ash_ai allows an attacker who can influence a model's output to hang the tool loop and drive unbounded, repeated model requests.
AshAi.ToolLoop classifies a model response of :tool_calls, then filters the calls through normalize_tool_calls/2 and unprocessed_tool_calls/2. Both can empty the list: a call missing a valid name, or one reusing a tool_call_id that already has a result in history, is dropped. With an empty list the loop appended nothing and recursed with a byte-identical message list, so the conversation never advanced and the same request was re-sent every iteration. Under the supported max_iterations: :infinity this never terminated; otherwise it exhausted the full budget. Prompt-injected content can make the model re-emit a spent tool_call_id. The fix treats an empty post-filter list as terminal.
This issue affects ash_ai: from 0.6.0 before 1.0.0.
Weakness: CWE-835
Which versions are affected by CVE-2026-82579?
1 open source package ship an affected version, including ash_ai.
| Package | Affected | Fixed in |
|---|---|---|
ash_ai Hex | From 0.6.0 | 1.0.0 |
How do I fix CVE-2026-82579?
Upgrade ash_ai to 1.0.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-82579 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82579 exists.
Sources
Also known as EEF-CVE-2026-82579, GHSA-rcx7-x2w5-mmc2.