CVE-2026-4964

MEDIUM

letta-ai letta File URL message_helper.py _convert_message_create_to_message server-side request forgery

Title source: cna

Description

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 manipulation of the argument ImageContent leads to server-side request forgery. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

References (4)

Core 4

Core References

Vdb Entry, Technical Description vdb-entry technical-description

VDB-353841 | letta-ai letta File URL message_helper.py _convert_message_create_to_message server-side request forgery

https://vuldb.com/?id.353841

Signature, Permissions Required signature permissions-required

VDB-353841 | CTI Indicators (IOB, IOC, IOA)

https://vuldb.com/?ctiid.353841

Third Party Advisory third-party-advisory

Submit #777645 | letta-ai letta 0.16.4 CWE-918

https://vuldb.com/?submit.777645

Exploit exploit

https://gist.github.com/YLChen-007/fde4d5ed6ac4aa876f73f8954c6214da

Scores

CVSS v3 6.3

EPSS 0.0033

EPSS Percentile 24.3%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact partial

Details

CWE

CWE-918

Status published

Products (2)

letta/letta 0.16.4

letta-ai/letta 0.16.4

Published Mar 27, 2026

Tracked Since Mar 29, 2026