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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.

PUBLISHED Reserved 2026-03-27 | Published 2026-03-27 | Updated 2026-03-31 | Assigner VulDB




MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
MEDIUM: 6.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
MEDIUM: 6.3CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
6.5AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR

Problem types

Server-Side Request Forgery

Product status

0.16.4
affected

Timeline

2026-03-27:Advisory disclosed
2026-03-27:VulDB entry created
2026-03-27:VulDB entry last update

Credits

Eric-z (VulDB User) reporter

VulDB coordinator

References

vuldb.com/?id.353841 (VDB-353841 | letta-ai letta File URL message_helper.py _convert_message_create_to_message server-side request forgery) vdb-entry technical-description

vuldb.com/?ctiid.353841 (VDB-353841 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/?submit.777645 (Submit #777645 | letta-ai letta 0.16.4 CWE-918) third-party-advisory

gist.github.com/YLChen-007/fde4d5ed6ac4aa876f73f8954c6214da exploit

cve.org (CVE-2026-4964)

nvd.nist.gov (CVE-2026-4964)

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