CVE-2026-77956
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Summary
Improper Control of Generation of Code (Code Injection) vulnerability in ash-project ash_ai allows a remote, unauthenticated client to execute arbitrary Elixir code.
AshAi.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.
This issue affects ash_ai: from 0.1.0 before 1.0.0.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| ash-project | ash_ai | 0.1.0 < 1.0.0 | affected |
| ash-project | ash_ai | 4aab131d40a0bd5a8cf0b3c4eaaa59d49565f3d1 < e9948254b5659c1143b73dc2f59f457931e64514 | affected |
Weaknesses
- CWE-94: CWE-94 Improper Control of Generation of Code ('Code Injection')
References
- https://github.com/ash-project/ash_ai/security/advisories/GHSA-2g59-hg7m-qc83
- https://cna.erlef.org/cves/CVE-2026-77956.html
- https://osv.dev/vulnerability/EEF-CVE-2026-77956
- https://github.com/ash-project/ash_ai/commit/e9948254b5659c1143b73dc2f59f457931e64514
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