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CVE-2026-77956— EEx template evaluation of prompt content in AshAi enables remote code execution

Quick assessment

Affected
ash-project ash_ai
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ash-project 的 ash_ai 中存在代码生成控制不当（代码注入）漏洞，允许远程、未认证的客户机执行任意 Elixir 代码。 通过 评估提示（prompt）内容。文档中记载的 形式的提示，其内容可依据动作参数构建。因此，当提示动作的文本中包含了来自请求的数据时，这些由攻击者控制的文本会被编译并作为 EEx 模板（Elixir 源码）执行。类似 的内容会在向模型发起请求之前就在服务器上执行，且只需访问提示动作即可触发，无需身份验证。该修复措施停止将函数提供的提示内容作为 EEx 进行评估；只有静态配置的模

CVSS 10.0 · Critical
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I. Basic Information for CVE-2026-77956

Vulnerability Information
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Vulnerability Title
EEx template evaluation of prompt content in AshAi enables remote code execution
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ash-project ash_ai 0.1.0 ~ 1.0.0 cpe:2.3:a:ash-project:ash_ai:*:*:*:*:*:*:*:*
ash-project ash_ai 4aab131d40a0bd5a8cf0b3c4eaaa59d49565f3d1 ~ e9948254b5659c1143b73dc2f59f457931e64514 cpe:2.3:a:ash-project:ash_ai:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-77956

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III. Intelligence Information for CVE-2026-77956

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Other References for CVE-2026-77956 (4)

IV. Related Vulnerabilities

Same product: ash_ai
Same vendor: ash-project
Same weakness: CWE-94

V. Comments for CVE-2026-77956

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