What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-27 · updated 2026-06-17
• Weakness: CWE-918

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.

Affected products

• letta-ai letta: 0.16.4

References

• https://gist.github.com/YLChen-007/fde4d5ed6ac4aa876f73f8954c6214da
• https://vuldb.com/?ctiid.353841
• https://vuldb.com/?id.353841
• https://vuldb.com/?submit.777645

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