CVE-2021-3769: OS Command Injection in ohmyzsh/ohmyzsh

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-11-30 · updated 2026-06-17
Weakness: CWE-78

Description

# Vulnerability in `pygmalion`, `pygmalion-virtualenv` and `refined` themes **Description**: these themes use `print -P` on user-supplied strings to print them to the terminal. All of them do that on git information, particularly the branch name, so if the branch has a specially-crafted name the vulnerability can be exploited. **Fixed in**: [b3ba9978](https://github.com/ohmyzsh/ohmyzsh/commit/b3ba9978). **Impacted areas**: - `pygmalion` theme. - `pygmalion-virtualenv` theme. - `refined` theme.

Affected products

ohmyzsh/ohmyzsh: before 2021-11-11 — fixed in 2021-11-11

How to fix

Upgrade to a fixed version: ohmyzsh/ohmyzsh 2021-11-11. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2021-3769 or the next vulnerability affects your stack