Vulnerability-Lookup

CVE-2026-77956 (GCVE-0-2026-77956)

Vulnerability from cvelistv5 – Published: 2026-08-31 00:56 – Updated: 2026-08-31 16:01

Title

EEx template evaluation of prompt content in AshAi enables remote code execution

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.

Severity

8.9 (High)


                        
                          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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-31 16:01 UTC

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')

Assigner

EEF mitre root

References

4 references

URL	Tags
https://github.com/ash-project/ash_ai/security/ad…	vendor-advisoryrelated
https://cna.erlef.org/cves/CVE-2026-77956.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-77956	related
https://github.com/ash-project/ash_ai/commit/e994…	patch

Impacted products

2 products

Vendor	Product	Version	CPE status
ash-project	ash_ai	Affected: 0.1.0 , < 1.0.0 (semver) cpe:2.3:a:ash-project:ash_ai::::::::
ash-project	ash_ai	Affected: 4aab131d40a0bd5a8cf0b3c4eaaa59d49565f3d1 , < e9948254b5659c1143b73dc2f59f457931e64514 (git) cpe:2.3:a:ash-project:ash_ai::::::::

Credits

Peter Ullrich Peter Ullrich Zach Daniel / Ash Project Jonatan Männchen / EEF

Show details on NVD website

JSON

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Content such as \u003ccode\u003e\u0026lt;%= System.cmd(...) %\u0026gt;\u003c/code\u003e 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.\u003c/p\u003e\\n\u003cp\u003eThis issue affects ash_ai: from 0.1.0 before 1.0.0.\u003c/p\u003e\", \"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 -\u003e ... end` form lets the prompt content be built from action arguments, so when a `prompt` action\u0027s text incorporates request data, that attacker-controlled text is compiled and run as an EEx template (Elixir source). Content such as `\u003c%= System.cmd(...) %\u003e` 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.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-94\", \"description\": \"CWE-94 Improper Control of Generation of Code (\u0027Code Injection\u0027)\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:ash-project:ash_ai:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.0.0\", \"versionStartIncluding\": \"0.1.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-08-31T15:08:21.204Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-77956\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-31T16:01:41.879Z\", \"dateReserved\": \"2026-08-30T17:30:01.409Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-08-31T00:56:26.440Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-77956

Vulnerability from fkie_nvd - Published: 2026-08-31 01:16 - Updated: 2026-08-31 16:19

Severity

8.9 (High) - 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

Summary

References

	URL	Tags
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://cna.erlef.org/cves/CVE-2026-77956.html
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ash-project/ash_ai/commit/e9948254b5659c1143b73dc2f59f457931e64514
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/ash-project/ash_ai/security/advisories/GHSA-2g59-hg7m-qc83
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://osv.dev/vulnerability/EEF-CVE-2026-77956
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/ash-project/ash_ai/security/advisories/GHSA-2g59-hg7m-qc83

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:ash-project:ash_ai:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.AshAi.Actions.Prompt\u0027"
          ],
          "packageName": "ash_ai",
          "packageURL": "pkg:hex/ash_ai",
          "product": "ash_ai",
          "programFiles": [
            "lib/ash_ai/actions/prompt.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.AshAi.Actions.Prompt\u0027: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": [
            "\u0027Elixir.AshAi.Actions.Prompt\u0027"
          ],
          "packageName": "ash-project/ash_ai",
          "packageURL": "pkg:github/ash-project/ash_ai",
          "product": "ash_ai",
          "programFiles": [
            "lib/ash_ai/actions/prompt.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.AshAi.Actions.Prompt\u0027:build_context/3"
            }
          ],
          "repo": "https://github.com/ash-project/ash_ai",
          "vendor": "ash-project",
          "versions": [
            {
              "lessThan": "e9948254b5659c1143b73dc2f59f457931e64514",
              "status": "affected",
              "version": "4aab131d40a0bd5a8cf0b3c4eaaa59d49565f3d1",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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 -\u003e ... end form lets the prompt content be built from action arguments, so when a prompt action\u0027s text incorporates request data, that attacker-controlled text is compiled and run as an EEx template (Elixir source). Content such as \u003c%= System.cmd(...) %\u003e 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."
    }
  ],
  "id": "CVE-2026-77956",
  "lastModified": "2026-08-31T16:19:12.900",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "LOCAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.9,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "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/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:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-77956",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-31T16:01:20.485407Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-31T01:16:49.563",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://cna.erlef.org/cves/CVE-2026-77956.html"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/ash-project/ash_ai/commit/e9948254b5659c1143b73dc2f59f457931e64514"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/ash-project/ash_ai/security/advisories/GHSA-2g59-hg7m-qc83"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-77956"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/ash-project/ash_ai/security/advisories/GHSA-2g59-hg7m-qc83"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-77956 (GCVE-0-2026-77956)

FKIE_CVE-2026-77956

Tags

Sightings

Nomenclature