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vuln-cve/data/2026/77xxx/CVE-2026-77956.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-77956",
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"state": "PUBLISHED",
"assignerShortName": "EEF",
"dateReserved": "2026-08-30T17:30:01.409Z",
"datePublished": "2026-08-31T00:56:26.440Z",
"dateUpdated": "2026-08-31T16:01:41.879Z"
},
"containers": {
"cna": {
"affected": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:ash-project:ash_ai:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"'Elixir.AshAi.Actions.Prompt'"
],
"packageName": "ash_ai",
"packageURL": "pkg:hex/ash_ai",
"product": "ash_ai",
"programFiles": [
"lib/ash_ai/actions/prompt.ex"
],
"programRoutines": [
{
"name": "'Elixir.AshAi.Actions.Prompt':build_context/3"
}
],
"repo": "https://github.com/ash-project/ash_ai",
"vendor": "ash-project",
"versions": [
{
"lessThan": "1.0.0",
"status": "affected",
"version": "0.1.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:ash-project:ash_ai:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"'Elixir.AshAi.Actions.Prompt'"
],
"packageName": "ash-project/ash_ai",
"packageURL": "pkg:github/ash-project/ash_ai",
"product": "ash_ai",
"programFiles": [
"lib/ash_ai/actions/prompt.ex"
],
"programRoutines": [
{
"name": "'Elixir.AshAi.Actions.Prompt':build_context/3"
}
],
"repo": "https://github.com/ash-project/ash_ai",
"vendor": "ash-project",
"versions": [
{
"lessThan": "e9948254b5659c1143b73dc2f59f457931e64514",
"status": "affected",
"version": "4aab131d40a0bd5a8cf0b3c4eaaa59d49565f3d1",
"versionType": "git"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:ash-project:ash_ai:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.0.0",
"versionStartIncluding": "0.1.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "reporter",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Zach Daniel / Ash Project"
},
{
"lang": "en",
"type": "coordinator",
"value": "Jonatan Männchen / EEF"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "<p>Improper Control of Generation of Code (Code Injection) vulnerability in ash-project ash_ai allows a remote, unauthenticated client to execute arbitrary Elixir code.</p>\n<p><code>AshAi.Actions.Prompt</code> evaluates prompt content through <code>EEx.eval_string/2</code>. The documented <code>prompt: fn input, context -&gt; ... end</code> form lets the prompt content be built from action arguments, so when a <code>prompt</code> action's text incorporates request data, that attacker-controlled text is compiled and run as an EEx template (Elixir source). Content such as <code>&lt;%= System.cmd(...) %&gt;</code> 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.</p>\n<p>This issue affects ash_ai: from 0.1.0 before 1.0.0.</p>"
},
{
"base64": false,
"type": "text/markdown",
"value": "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\n`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.\n\nThis issue affects ash_ai: from 0.1.0 before 1.0.0."
}
],
"value": "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 -> ... 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.\n\nThis issue affects ash_ai: from 0.1.0 before 1.0.0."
}
],
"impacts": [
{
"capecId": "CAPEC-242",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-242 Code Injection"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "LOCAL",
"baseScore": 8.9,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "HIGH",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "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",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-94",
"description": "CWE-94 Improper Control of Generation of Code ('Code Injection')",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF",
"dateUpdated": "2026-08-31T15:08:21.204Z"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/ash-project/ash_ai/security/advisories/GHSA-2g59-hg7m-qc83"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-77956.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-77956"
},
{
"tags": [
"patch"
],
"url": "https://github.com/ash-project/ash_ai/commit/e9948254b5659c1143b73dc2f59f457931e64514"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "EEx template evaluation of prompt content in AshAi enables remote code execution"
},
"adp": [
{
"references": [
{
"url": "https://github.com/ash-project/ash_ai/security/advisories/GHSA-2g59-hg7m-qc83",
"tags": [
"exploit"
]
}
],
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-08-31T16:01:20.485407Z",
"id": "CVE-2026-77956",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-08-31T16:01:41.879Z"
}
}
]
}
}
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