{"id":"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 -\u003e ... 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 \u003c%= System.cmd(...) %\u003e 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.","aliases":["EEF-CVE-2026-77956","GHSA-2g59-hg7m-qc83"],"modified":"2026-09-01T03:46:06.688491356Z","published":"2026-08-31T00:56:26.440Z","database_specific":{"cna_assigner":"EEF","cwe_ids":["CWE-94"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77956.json","unresolved_ranges":[{"extracted_events":[{"introduced":"4aab131d40a0bd5a8cf0b3c4eaaa59d49565f3d1"},{"fixed":"e9948254b5659c1143b73dc2f59f457931e64514"}],"source":"AFFECTED_FIELD"}]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ash-project/ash_ai","events":[{"introduced":"9be71660e448d601b6b5d1846d227c0b52fb64ac"},{"fixed":"f72b14744996e71df6d73480d617d963f340597b"},{"fixed":"e9948254b5659c1143b73dc2f59f457931e64514"}],"database_specific":{"extracted_events":[{"introduced":"0.1.0"},{"fixed":"1.0.0"}],"source":["DESCRIPTION","REFERENCES"]}}],"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","v0.5.0","v0.4.0","v0.3.0","v0.2.14","v0.2.13","v0.2.12","v0.2.11","v0.2.10","v0.2.9","v0.2.8","v0.2.7","v0.2.6","v0.2.5","v0.2.4","v0.2.3","v0.2.2","v0.2.1","v0.1.11","v0.1.10","v0.1.9","v0.1.8","v0.1.7","v0.1.6","v0.1.5","v0.1.4","v0.1.3","v0.1.2","v0.1.1","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77956.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"}]}