Documentation files on more than 100 websites are referencing potentially dangerous executable content that gets installed automatically when visited by many AI agents. A few dozen companies, some of them Fortune 500s, are among those that executed proof-of-concept code. At least one misconfigured site is directing visitors, human or AI, to live malware.
The potentially dangerous content is in llms.txt and llms-full.txt files, an emerging convention websites employ to provide machine-readable summaries of the site’s content and its high-level structure. These files are the AI equivalent of the robots.txt standard that instructs search engines how to index the site’s content.
The files are misconfigured because they list non-existent packages from PyPI, npm, and other registries along with instructions on how to install them. Because the package names are unregistered, an attacker could register one and use it to host ransomware or any other type of harmful package. The vulnerability occurs when a coding agent with permission to run shell commands treats the file as authoritative setup documentation. Some AI agents will then download the package and run it. In other cases, the LLM files point to non-existent domain names. In one case, it was: “As an example of writing integration tests for [redacted] applications you can use the [redacted] test framework.” An attacker can then register the site and plant malicious instructions on it. READ MORE...
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