CVE-2025-6101Public exploit

Authenticated code execution via evaluated function arguments

Published Jun 16, 2025 · Updated Jun 17, 2025

Code injection in Letta 0.4.0 and 0.4.1 allows remote authenticated users to execute Python code through crafted function messages. The function_message routine in letta/letta/interface.py extracts function_args from messages beginning with “Running” and passes that string directly to eval() for several recognized function names. Exploitation requires control of a qualifying message and reaches code execution with the privileges of the Letta process.

CVSS severityUnavailable
Unscored
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Letta 0.4.0 and 0.4.1 allows remote authenticated users to execute Python code through crafted function messages. The function_message routine in letta/letta/interface.py extracts function_args from messages beginning with “Running” and passes that string directly to eval() for several recognized function names. Exploitation requires control of a qualifying message and reaches code execution with the privileges of the Letta process.

The record

CVE
CVE-2025-6101
Published
Jun 16, 2025
Updated
Jun 17, 2025
Vendor
Letta
Product
Letta
Classifications
CWE-94, CWE-95, T1059.006
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.4.0
  2. Affected versionversion=0.4.1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

Letta · Lettaversion=0.4.0; version=0.4.1

Published CVSS scores

5.2VulDB CNAAV:A/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR
5.5VulDB CNACVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
5.1VulDB CNACVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
5.5VulDB CNACVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-95Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
T1059.006Command and Scripting Interpreter: Python

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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