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CVE-2026-4964— letta-ai letta File URL message_helper.py _convert_message_create_to_message server-side request forgery

Quick assessment

Affected
letta-ai letta
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Letta-ai letta是Letta-ai开源的一个具有内存、推理和上下文管理的有状态代理框架。 Letta-ai letta 0.16.4版本存在安全漏洞，该漏洞源于对文件letta/helpers/message_helper.py中参数ImageContent的错误操作，可能导致服务端请求伪造。

CVSS 6.3 · Medium EPSS 0.39% · P32
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I. Basic Information for CVE-2026-4964

Vulnerability Information
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Vulnerability Title
letta-ai letta File URL message_helper.py _convert_message_create_to_message server-side request forgery
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Letta-ai letta 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Letta-ai letta是Letta-ai开源的一个具有内存、推理和上下文管理的有状态代理框架。 Letta-ai letta 0.16.4版本存在安全漏洞，该漏洞源于对文件letta/helpers/message_helper.py中参数ImageContent的错误操作，可能导致服务端请求伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
letta-ai letta 0.16.4 cpe:2.3:a:letta:letta:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-4964

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III. Intelligence Information for CVE-2026-4964

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Vendor Advisories for CVE-2026-4964 (2)

Proof of Concept for CVE-2026-4964 (1)

IV. Related Vulnerabilities

Same product: letta
Same vendor: letta-ai
Same weakness: CWE-918

V. Comments for CVE-2026-4964

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