{"id":"EEF-CVE-2026-82579","summary":"AshAi tool loop never terminates when all tool calls are filtered out, enabling denial of service","details":"## Summary\n\nLoop 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.\n\n`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.\n\nThis issue affects ash_ai: from 0.6.0 before 1.0.0.","aliases":["CVE-2026-82579","GHSA-rcx7-x2w5-mmc2"],"modified":"2026-09-08T02:45:02.847571733Z","published":"2026-08-31T01:07:49.185Z","database_specific":{"cwe_ids":["CWE-835"],"capec_ids":["CAPEC-130"],"cpe_ids":["cpe:2.3:a:ash-project:ash_ai:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"https://github.com/ash-project/ash_ai/security/advisories/GHSA-rcx7-x2w5-mmc2"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-82579.html"},{"type":"FIX","url":"https://github.com/ash-project/ash_ai/commit/53325fdab90afab628c6a53232ef2a9001580bd9"},{"type":"PACKAGE","url":"https://hex.pm/packages/ash_ai"}],"affected":[{"package":{"name":"ash_ai","ecosystem":"Hex","purl":"pkg:hex/ash_ai"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.6.0"},{"fixed":"1.0.0"}]}],"versions":["0.6.0","0.6.1","0.7.0","0.7.1","0.7.2","0.7.3","0.8.0","0.8.1","0.8.2"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-82579.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/ash-project/ash_ai","events":[{"introduced":"bc2122f78fca6c11d8ec2b9ac53148ec17476460"},{"fixed":"53325fdab90afab628c6a53232ef2a9001580bd9"}]}],"versions":["v0.8.2","v0.8.1","v0.8.0","v0.7.3","v0.7.2","v0.7.1","v0.7.0","v0.6.1","v0.6.0"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-82579.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}],"credits":[{"name":"Peter Ullrich","type":"FINDER"},{"name":"Peter Ullrich","type":"REPORTER"},{"name":"Zach Daniel / Ash Project","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"COORDINATOR"}]}