SSRF in Letta

CVE-2026-4964

A security vulnerability has been detected in letta-ai letta 0.16.4. This vulnerability affects the function _convert_message_create_to_message of the file letta/helpers/message_helper.py of the component File URL Handler. Such manipulatio…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.000 (2.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-4964?
CVE-2026-4964 is a medium-severity vulnerability in Letta, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.3/10. Published 2026-03-27.
How severe is CVE-2026-4964?
Medium severity. CVSS v3 base score is 6.3 out of 10.