Server-side Request Forgery (SSRF) Affecting letta package, versions [,0.16.7)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Server-side Request Forgery (SSRF) vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-PYTHON-LETTA-15874392
- published2 Apr 2026
- disclosed27 Mar 2026
- creditUnknown
Introduced: 27 Mar 2026
CVE-2026-4964 (opens in a new tab)How to fix?
Upgrade letta to version 0.16.7 or higher.
Overview
letta is a Create LLM agents with long-term memory and custom tools
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) via the _convert_message_create_to_message() function in the File URL Handler component when processing the ImageContent argument. An attacker can access internal resources and potentially exfiltrate sensitive information or manipulate server-side actions by supplying crafted URLs.