CVE-2026-4964 letta-ai letta File URL message_helper.py _convert_message_create_to_message server-side request forgery
Remote attackers can exploit a file URL handler flaw in letta to perform server-side request forgery, potentially accessing internal resources.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4964?
CVE-2026-4964 is a medium-severity server-side request forgery vulnerability in letta-ai letta, published on 27 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-4964?
It affects 1 product.
Products include Letta Letta.
How do I fix CVE-2026-4964?
No fix has been published for CVE-2026-4964 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-4964 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4964 exists.
Other vulnerabilities in letta-ai letta
Sources
Also known as GHSA-4f2v-q2vh-v8hc.