{"id":"CVE-2026-77956","aliases":["EEF-CVE-2026-77956","GHSA-2g59-hg7m-qc83"],"url":"https://o3.security/vulnerability/CVE-2026-77956","summary":"EEx template evaluation of prompt content in AshAi enables remote code execution","details":"Improper Control of Generation of Code (Code Injection) vulnerability in ash-project ash_ai allows a remote, unauthenticated client to execute arbitrary Elixir code.\n\nAshAi.Actions.Prompt evaluates prompt content through EEx.eval_string/2. The documented prompt: fn input, context -> ... end form lets the prompt content be built from action arguments, so when a prompt action's text incorporates request data, that attacker-controlled text is compiled and run as an EEx template (Elixir source). Content such as <%= System.cmd(...) %> therefore executes on the server before any model request is made, requiring no authentication beyond reaching a prompt action. The fix stops evaluating function-supplied prompt content as EEx; only statically configured templates are evaluated.\n\nThis issue affects ash_ai: from 0.1.0 before 1.0.0.","published":"2026-08-31T00:56:26.440Z","modified":"2026-09-01T03:46:06.688491356Z","cvss":null,"epss":{"score":0.0038,"percentile":0.30978,"asOf":"2026-08-31"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[],"fix":{"url":"https://github.com/ash-project/ash_ai/commit/e9948254b5659c1143b73dc2f59f457931e64514","label":"ash-project/ash_ai@e994825"},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-77956.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-77956"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77956.json"},{"type":"ADVISORY","url":"https://github.com/ash-project/ash_ai/security/advisories/GHSA-2g59-hg7m-qc83"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77956"},{"type":"FIX","url":"https://github.com/ash-project/ash_ai/commit/e9948254b5659c1143b73dc2f59f457931e64514"},{"type":"PACKAGE","url":"https://github.com/ash-project/ash_ai"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-01T03:46:06.688491356Z"}}