CVE-2026-4964 — MEDIUM (6.3)

Vulnerability 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.

CVSS Score

6.3

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

LOW

Availability

LOW

Affected Products

Vendor	Product	Versions
Letta	Letta	0.16.4

Related Weaknesses (CWE)

CWE-918

References

https://gist.github.com/YLChen-007/fde4d5ed6ac4aa876f73f8954c6214daExploitThird Party Advisory
https://vuldb.com/?ctiid.353841Permissions RequiredVDB Entry
https://vuldb.com/?id.353841Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.777645ExploitThird Party AdvisoryVDB Entry

FAQ

What is CVE-2026-4964?

CVE-2026-4964 is a vulnerability with a CVSS score of 6.3 (MEDIUM). 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 compo...

How severe is CVE-2026-4964?

CVE-2026-4964 has been rated MEDIUM with a CVSS base score of 6.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-4964?

Check the references section above for vendor advisories and patch information. Affected products include: Letta Letta.