---
title: "CVE-2026-33646: Mise Vulnerable to Arbitrary Code Execution via Tera Templates in .tool-versions Files (Trust Bypass)"
url: https://erroneo.us/security/cve/CVE-2026-33646/
description: "CVE-2026-33646 (mise (crates.io (Rust))): mise manages dev tools like node, python, cmake, and terraform. Prior to 2026.3.10, mise processes .tool-versions…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-26
date_modified: 2026-07-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-33646"
kev: false
cvss: 9.6
epss: 0.00685
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-33646: Mise Vulnerable to Arbitrary Code Execution via Tera Templates in .tool-versions Files (Trust Bypass)

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.7% , percentile 52: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 52% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.
- Only applies if your dependency tree includes mise (crates.io (Rust)) < 2026.3.10, fixed in 2026.3.10 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- crates.io (Rust) `mise` < 2026.3.10 → fixed: 2026.3.10

## Affected products (CVE record)

- jdx mise: < 2026.3.10

## Severity

- GitHub_M CVSS 3.1: 9.6 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.6 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.69% probability of exploitation activity in the next 30 days; percentile 52.

## Sources

- [GitHub Advisory GHSA-fjj5-v948-whjj](https://github.com/advisories/GHSA-fjj5-v948-whjj)
- [CVE.org record CVE-2026-33646](https://www.cve.org/CVERecord?id=CVE-2026-33646)
- [NVD entry CVE-2026-33646](https://nvd.nist.gov/vuln/detail/CVE-2026-33646)
- [github.com](https://github.com/jdx/mise/security/advisories/GHSA-fjj5-v948-whjj)

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Source page: https://erroneo.us/security/cve/CVE-2026-33646/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt