Exploit discussion active in current signal (1 latest mentions)
Immediate actions
Patch affected systems immediately
Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft
Recommended action window: High priority (within 72h)
NVD description
mise manages dev tools like node, python, cmake, and terraform. Prior to 2026.3.10, mise processes .tool-versions files through the Tera template engine during parsing, with the exec() function registered, enabling arbitrary command execution. Unlike .mise.toml files, .tool-versions files are not subject to trust verification in non-paranoid mode. This means an attacker can place a malicious .tool-versions file in a git repository, and when a victim with mise activated cds into the directory, arbitrary commands execute without any trust prompt. This vulnerability is fixed in 2026.3.10.
🚨Critical - mise Arbitrary Code Execution via Tera Templates in .tool-versions (CVE-2026-33646)
mise parses .tool-versions files through the Tera template engine with the exec() function registered, but unlike .mise.toml, these files are not subject to trust verification in the default (non-paranoid) mode. An attacker can commit a malicious .tool-versions file with Tera syntax like {{ exec(command="...") }} to a git repository.
When a victim with Mise activates CDs into the directory, the shell hook parses the file and runs arbitrary commands silently - no trust prompt, no warning - with the victim's full privileges and environment, exposing tokens, API keys, and SSH agents. Since .tool-versions is a widely committed convention, a malicious PR could execute code on every reviewer's machine.
👉Upgrade to mise 2026.3.10.
Post summary
The advisory reveals CVE-2026-33646, a critical arbitrary‑code‑execution flaw in mise’s handling of .tool-versions via the Tera template engine, shows a PoC example, and advises updating to version 2026.3.10.
