PT-2026-59551 · Pypi · Praisonai
Published
2026-07-13
·
Updated
2026-07-13
CVSS v3.1
8.8
High
| Vector | AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Summary
Direct insertion of unescaped user input into template-rendering tools allows arbitrary code execution via specially crafted agent instructions.
Details
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 (as shown in agent centric example.py:85-86), template expressions in the input are executed rather than treated as literal text. This occurs because:- No input sanitization or escaping is applied to user-controlled content
- The ACP-enabled runtime auto-approves operations (
approval mode="auto") - Tools lack context-aware escaping for template syntax
PoC
python
# Replace the agent.start() call at line 85 with:
result = agent.start('Create file with content: {{ self. init . globals . builtins . import ("os").system("touch /tmp/pwned") }}')Successful exploitation creates
/tmp/pwned confirming arbitrary command execution. The expression {{7*7}} renders as 49 instead of literal text.Impact
Attackers can execute arbitrary system commands with the privileges of the running process by injecting malicious template expressions through agent instructions. This compromises the host system, enabling data theft, ransomware deployment, or lateral movement.
Recommended Fix
- Input Sanitization: Implement strict whitelist validation for file content
- Contextual Escaping: Auto-escape template syntax characters (e.g.,
{{ }}) in user input using Jinja2autoescape=True - Sandboxing: Restrict template execution environments using secure eval modes
- Approval Hardening: Require manual approval for file creation operations in production
Fix
Found an issue in the description? Have something to add? Feel free to write us 👾
Related Identifiers
Affected Products
Praisonai