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CVE-2026-31236

9.8 · CRITICAL

The llm CLI tool thru 0.27.1 contains a critical code injection vulnerability via its --functions command-line argument.

Published May 12, 2026CWE-94EPSS 0.46%

Overview

CVE-2026-31236 is a critical-severity vulnerability. It was published on May 12, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/simonw/llmRefwww.notion.so/CVE-2026-31236-35d1e139318881a4a0f1fffcf671f7e3Refaccess.redhat.com/security/cve/CVE-2026-31236Refbugzilla.redhat.com/show_bug.cgi?id=2476636Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31236.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31236?

CVE-2026-31236 is a critical-severity vulnerability. It was published on May 12, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-31236?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-31236?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-31236?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31236 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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