CVE-2026-31236 llm CLI tool contains a code injection vulnerability via `--functions` command-line argument
Attackers can execute arbitrary Python code via the --functions argument in the llm CLI tool, requiring social engineering to trick victims into running malicious commands.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-31236?
CVE-2026-31236 is a critical code injection vulnerability in n/a, published on 12 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-94
Which versions are affected by CVE-2026-31236?
3 open source packages ship an affected version, including llm.
| Package | Affected | Fixed in |
|---|---|---|
llm PyPI | All versions to 0.27.1 | None |
llm PyPI | All versions to 0.27.1 | None |
llm PyPI | All versions to 0.27.1 | None |
How do I fix CVE-2026-31236?
No fix has been published for CVE-2026-31236 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-31236 being exploited?
There is no known exploitation of CVE-2026-31236 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-31236, GHSA-g76p-4vg5-f4qh, PYSEC-2026-400, UBUNTU-CVE-2026-31236.