CVE-2026-4965

Name: CVE-2026-4965
Creator: NVD / NIST
Published: 2026-03-27T18:16:06.59+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.60%

Last modified Jun 17, 2026

CVE-2026-4965 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A vulnerability was detected in letta-ai letta 0.16.4. This issue affects the function resolve_type of the file letta/functions/ast_parsers.py of the component Incomplete Fix CVE-2025-6101. EPSS estimates a 0.60% chance of exploitation in the next 30 days.

Description

A vulnerability was detected in letta-ai letta 0.16.4. This issue affects the function resolve_type of the file letta/functions/ast_parsers.py of the component Incomplete Fix CVE-2025-6101. Performing a manipulation results in improper neutralization of directives in dynamically evaluated code. The attack can be initiated remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Metrics

CVSS 3.1

9.8/10

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

CVSS 4.0

5.5/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.60%

44.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Letta	Letta	0.16.4

References

https://gist.github.com/YLChen-007/fc09bc447a73bba526c1642d9ce73ca5Exploit, Third Party Advisory
https://vuldb.com/?ctiid.353842Permissions Required, VDB Entry
https://vuldb.com/?id.353842Third Party Advisory, VDB Entry
https://vuldb.com/?submit.777654Exploit, Third Party Advisory, VDB Entry

Timeline

Published: Mar 27, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-4965?

How severe is CVE-2026-4965?

CVE-2026-4965 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.60% probability of exploitation in the next 30 days.

How do I fix CVE-2026-4965?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-4965?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST