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Vulnerability record · CVE-2026-77956 · published 31 August 2026

CVE-2026-77956: Code injection vulnerability

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.

8.9 CVSS 4.0 High EPSS 0.28% · top 81.5% CWE-94 · Code injection Deferred
8.9CVSS 4.0 base score
0.28%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
1 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://cna.erlef.org/cves/CVE-2026-77956.html
https://github.com/ash-project/ash_ai/commit/e9948254b5659c1143b73dc2f59f457931e64514
https://github.com/ash-project/ash_ai/security/advisories/GHSA-2g59-hg7m-qc83
https://osv.dev/vulnerability/EEF-CVE-2026-77956
https://github.com/ash-project/ash_ai/security/advisories/GHSA-2g59-hg7m-qc83

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Source: NIST National Vulnerability Database (record CVE-2026-77956), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.