Letta - RCE (CVE-2025-51482)

CVE-2025-51482 is a remote code execution vulnerability in letta-ai Letta 0.7.12, specifically within the /v1/tools/run endpoint, that allows attackers to execute arbitrary Python code and system commands by sending crafted payloads. This flaw enables threat actors to bypass intended sandbox restrictions, potentially leading to full system compromise and unauthorized access to sensitive data.

CrowdSec has been tracking this vulnerability and its exploits since 10th of September 2025.

Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2025-51482 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. CrowdSec data also reveals a clear uptick in attacks involving CVE-2025-51482 over the past week. Activity is above the usual baseline, suggesting growing attention from attackers. This may reflect rising awareness, recent exploit releases, or expanded targeting efforts.

Attackers exploit this vulnerability by sending crafted POST requests to the /v1/tools/run endpoint with a JSON payload containing malicious Python code in the source_code field, enabling remote command execution on the target server.