CVE-2026-77956

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Source
https://cve.org/CVERecord?id=CVE-2026-77956
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77956.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-77956
Aliases
Published
2026-08-31T00:56:26.440Z
Modified
2026-08-31T11:45:15.698754029Z
Severity
  • 10.0 (Critical) CVSS_V4 - 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 CVSS Calculator
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.

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77956.json",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "4aab131d40a0bd5a8cf0b3c4eaaa59d49565f3d1"
                },
                {
                    "fixed": "e9948254b5659c1143b73dc2f59f457931e64514"
                }
            ]
        }
    ],
    "cwe_ids": [
        "CWE-94"
    ],
    "cna_assigner": "EEF"
}
References

Affected packages

Git / github.com/ash-project/ash_ai

Affected ranges

Type
GIT
Repo
https://github.com/ash-project/ash_ai
Events
Introduced
9be71660e448d601b6b5d1846d227c0b52fb64ac
Fixed
f72b14744996e71df6d73480d617d963f340597b
Database specific
Show details 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0.1.0"
        },
        {
            "fixed": "1.0.0"
        }
    ]
}

Affected versions

v0.*
v0.1.0
v0.1.1
v0.1.10
v0.1.11
v0.1.2
v0.1.3
v0.1.4
v0.1.5
v0.1.6
v0.1.7
v0.1.8
v0.1.9
v0.2.1
v0.2.10
v0.2.11
v0.2.12
v0.2.13
v0.2.14
v0.2.2
v0.2.3
v0.2.4
v0.2.5
v0.2.6
v0.2.7
v0.2.8
v0.2.9
v0.3.0
v0.4.0
v0.5.0
v0.6.0
v0.6.1
v0.7.0
v0.7.1
v0.7.2
v0.7.3
v0.8.0
v0.8.1
v0.8.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77956.json"