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Critical Security Flaw in BerriAI LiteLLM Could Let Attackers Run Dangerous Commands

A serious security weakness has been found in BerriAI's LiteLLM software that could allow attackers to run harmful commands on the system. This flaw is actively being exploited, meaning attackers are already using it to cause damage. Small organisations using this software should act quickly to protect themselves.

09 June 2026

Reference: CVE-2026-42271

1. What is being reported?

The vulnerability affects certain versions of LiteLLM, a tool that helps connect to AI services. It allows anyone with a valid but possibly low-level access key to run any command they want on the computer running LiteLLM. This happens because some parts of the software accept detailed instructions without proper checks, letting attackers execute harmful actions.

2. What this means in plain English

If your organisation uses LiteLLM versions between 1.74.2 and before 1.83.7, attackers could take control of your system remotely. This could lead to data theft, disruption of services, or further attacks. Even users with limited access rights could exploit this flaw, so it is a serious risk.

3. Could this affect a small business?

Small businesses or charities using the affected LiteLLM versions are at risk, especially if they use the software to connect to AI services and have not updated it. Organisations not using LiteLLM or using a version 1.83.7 or later are unlikely to be affected.

4. What to do now

  • Check if your organisation uses BerriAI LiteLLM and identify the version installed.
  • If using a vulnerable version, update to version 1.83.7 or later as soon as possible.
  • If an update is not immediately possible, follow any mitigation steps provided by BerriAI or consider temporarily stopping use of the software.
  • Ask your IT provider to review access controls and monitor for unusual activity related to LiteLLM.

5. Ask your IT provider

Can you confirm if we use BerriAI LiteLLM software, and if so, have we updated it to the fixed version 1.83.7 or later to protect against the known command injection vulnerability CVE-2026-42271?

6. Bottom line

If you use LiteLLM, update it now to stop attackers from taking control of your system.

Information based on CISA KEV, NVD, and reputable security reporting.

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