CVE-2026-39891 HIGH

CVE-2026-39891: PraisonAI has a Template Injection in Agent Tool Definitions

Vendor Mervinpraison
Product PraisonAI
Weakness CWE-94 · Code injection
Published April 8, 2026
Last update April 9, 2026

CVSS base score

8.8/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

PraisonAI is a multi-agent teams system. Prior to 4.5.115, the create_agent_centric_tools() function returns tools (like acp_create_file) that process file content using template rendering. When user input from agent.start() is passed directly into these tools without escaping, template expressions in the input are executed rather than treated as literal text. This vulnerability is fixed in 4.5.115.

Key dates

02Disclosure timeline

April 8, 2026 CVE published
April 9, 2026 Record updated