llm CLI tool up to 0.27.1 exec --functions code injection

Summaryinfo

A vulnerability described as critical has been identified in llm CLI tool up to 0.27.1. Affected by this vulnerability is the function exec. Such manipulation of the argument --functions leads to code injection. This vulnerability is uniquely identified as CVE-2026-31236. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, has been found in llm CLI tool up to 0.27.1. Affected by this issue is the function exec. The manipulation of the argument --functions with an unknown input leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability. CVE summarizes:

The llm CLI tool thru 0.27.1 contains a critical code injection vulnerability via its --functions command-line argument. This argument is intended to allow users to provide custom Python function definitions. However, the tool directly executes the provided code using the unsafe exec() function without any sanitization, sandboxing, or security restrictions. An attacker can exploit this by crafting a malicious llm command with arbitrary Python code in the --functions argument and using social engineering to trick a victim into running it. This leads to arbitrary code execution on the victim's system, potentially granting the attacker full control.

This vulnerability is handled as CVE-2026-31236 since 03/09/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/03/2026). This vulnerability is assigned to T1059 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 315103 (Linux Distros Unpatched Vulnerability : CVE-2026-31236), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (315103). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Artificial Intelligence Software

Name

• llm CLI tool

Version

• 0.27.0
• 0.27.1

CPE 2.3info

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• 🔒

CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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