CVE-2026-77956 ash-project CVE debrief

Who should care

Users of ash_ai versions from 0.1.0 before 1.0.0 should be aware of this critical vulnerability and take immediate action to upgrade or mitigate the risk. This includes operators, platform administrators, vulnerability management teams, and security teams who need to assess the impact on their systems and implement necessary controls to prevent exploitation. Affected organizations should review their deployments, assess the risk, and apply the necessary patches or mitigations to prevent remote code execution attacks. Additionally, defenders should monitor for suspicious activity and implement compensating controls where necessary. Security teams should also review and update security configurations for ash_ai to ensure the vulnerability is properly addressed. Finally, asset inventory and change management processes should be updated to account for this vulnerability and ensure that all affected systems are properly tracked and remediated. This vulnerability requires immediate attention to prevent potential attacks, and defenders should prioritize patching or mitigating affected systems as soon as possible. The vulnerability's critical severity and potential for remote code execution make it essential for defenders to take swift action to protect their systems. Defenders should also consider implementing additional security measures, such as input validation and sanitization, to further reduce the risk of exploitation. By taking these steps, defenders can help prevent attacks and protect their systems from potential exploitation of this critical vulnerability. The CVE record provides additional context and details about the vulnerability, which defenders can use to inform their remediation efforts. Overall, defenders should be proactive in addressing this vulnerability and take all necessary steps to prevent potential attacks and protect their systems. This includes reviewing and updating security configurations, implementing compensating controls, and monitoring for suspicious activity. By prioritizing this vulnerability and taking swift action, defenders can help prevent attacks and protect their systems from potential exploitation. The vulnerability affects a

Technical summary

The CVE-2026-77956 vulnerability in ash_ai allows remote, unauthenticated clients to execute arbitrary Elixir code due to improper control of code generation. The issue arises from AshAi.Actions.Prompt evaluating prompt content through EEx.eval_string/2, which compiles and runs attacker-controlled text as EEx templates. This can lead to server-side code execution before any model request is made. The vulnerability affects ash_ai versions from 0.1.0 before 1.0.0.

Defensive priority

Critical vulnerability in ash_ai, allowing remote code execution with no authentication required.

Recommended defensive actions

• Upgrade ash_ai to version 1.0.0 or later
• Implement input validation and sanitization for prompt content
• Monitor for suspicious activity and implement compensating controls
• Review and update security configurations for ash_ai
• Restrict access to sensitive areas of the application

Evidence notes

The CVE-2026-77956 vulnerability in ash_ai allows remote, unauthenticated clients to execute arbitrary Elixir code due to improper control of code generation. The issue arises from AshAi.Actions.Prompt evaluating prompt content through EEx.eval_string/2, which compiles and runs attacker-controlled text as EEx templates. This can lead to server-side code execution before any model request is made. The vulnerability affects ash_ai versions from 0.1.0 before 1.0.0.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.