CVE-2026-77956Public exploitNetwork attack vector

Unauthenticated code execution via EEx prompt evaluation

Published Aug 31, 2026 · Updated Aug 31, 2026

Code injection in Ash AI before 1.0.0 allows remote attackers to execute arbitrary Elixir code through a reachable prompt action. AshAi.Actions.Prompt passes function-supplied prompt content derived from action arguments to EEx.eval_string/2, compiling attacker-controlled text as an Elixir template. Exposure requires an application to place request data in prompt text and expose that action across an untrusted boundary; execution occurs in the application's BEAM node before any model request.

CVSS severity10.0
Critical
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Ash AI before 1.0.0 allows remote attackers to execute arbitrary Elixir code through a reachable prompt action. AshAi.Actions.Prompt passes function-supplied prompt content derived from action arguments to EEx.eval_string/2, compiling attacker-controlled text as an Elixir template. Exposure requires an application to place request data in prompt text and expose that action across an untrusted boundary; execution occurs in the application's BEAM node before any model request.

The record

CVE
CVE-2026-77956
Published
Aug 31, 2026
Updated
Aug 31, 2026
Vendor
Ash Framework
Product
Ash AI
Classifications
CWE-94, T1059, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.1.0 <1.0.0
  2. Affected versionversion=4aab131d40a0bd5a8cf0b3c4eaaa59d49565f3d1 <e9948254b5659c1143b73dc2f59f457931e64514

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ash Framework · Ash AIversion=0.1.0 <1.0.0; version=4aab131d40a0bd5a8cf0b3c4eaaa59d49565f3d1 <e9948254b5659c1143b73dc2f59f457931e64514

Published CVSS scores

10.0GitHubCVSS: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 describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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