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

> Attackers can execute arbitrary code by placing malicious template files in repositories, bypassing trust checks in the mise developer tool.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 26 Jun 2026
- **Updated:** 29 Jun 2026
- **Also known as:** GHSA-fjj5-v948-whjj

## What is CVE-2026-33646?

CVE-2026-33646 is a critical code injection vulnerability in jdx mise, published on 26 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-33646?

2 open source packages ship an affected version, including mise.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mise` | crates.io | All versions | 2026.3.10 |
| `mise` | crates.io | All versions | 2026.3.10 |

## How do I fix CVE-2026-33646?

Upgrade mise to 2026.3.10 or later.

## Is CVE-2026-33646 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33646 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-33646 and fix it if it is affected.

What it is: CVE-2026-33646 is a critical code injection vulnerability in jdx mise, published on 26 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33646 exists.

Affected packages and fixed versions:
- mise (crates.io): affected all versions; fixed in 2026.3.10
- mise (crates.io): affected all versions; fixed in 2026.3.10

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-33646/ (Markdown: https://insights.sbomify.com/CVE-2026-33646/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33646
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33646
- OSV: https://osv.dev/vulnerability/CVE-2026-33646

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-33646/
Summaries are generated and may contain mistakes; the official description above is the record.