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
- Letta — versions 0.16.4
- Letta-ai Letta — versions 0.16.4
Weakness classification (CWE)
References
- VDB-353841 | letta-ai letta File URL message_helper.py _convert_message_create_to_message server-side request forgery (technical-description, Third Party Advisory, VDB Entry, vdb-entry)
- VDB-353841 | CTI Indicators (IOB, IOC, IOA) (signature, Permissions Required, permissions-required, VDB Entry)
- Submit #777645 | letta-ai letta 0.16.4 CWE-918 (Exploit, Third Party Advisory, VDB Entry, third-party-advisory)
- cna@vuldb.com (Exploit, Third Party Advisory, exploit)
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.