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.
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Mon, 31 Aug 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 31 Aug 2026 01:45:00 +0000

Type Values Removed Values Added
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.
Title AshAi tool loop never terminates when all tool calls are filtered out, enabling denial of service
First Time appeared Ash-project
Ash-project ash Ai
Weaknesses CWE-835
CPEs cpe:2.3:a:ash-project:ash_ai:*:*:*:*:*:*:*:*
Vendors & Products Ash-project
Ash-project ash Ai
References
Metrics cvssV4_0

{'score': 6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: EEF

Published:

Updated: 2026-08-31T16:05:58.542Z

Reserved: 2026-08-30T20:00:01.852Z

Link: CVE-2026-82579

cve-icon Vulnrichment

Updated: 2026-08-31T16:05:53.304Z

cve-icon NVD

Status : Received

Published: 2026-08-31T02:17:02.270

Modified: 2026-08-31T16:19:16.967

Link: CVE-2026-82579

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-31T02:30:18Z

Weaknesses