Is CVE-2026-4964 actively exploited?

No active exploitation of CVE-2026-4964 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4964 be exploited remotely?

Yes. CVE-2026-4964 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-4964?

CVE-2026-4964 has a CVSS score of 6.3 (MEDIUM).

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MEDIUM

CVE-2026-4964

CWE-918Published: March 27, 2026· Updated: Mar 30, 2026

6.3

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:1.4th

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.

NVD Source

Technical Analysis

CVE-2026-4964 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.