CVE-2026-55441: jdx mise arbitrary command execution via task-include files

CVE-2026-55441 · Severity: high · CVSS 8.6 · Published 2026-06-26

mise is a development tool manager used to handle environments like Node.js and Python. A security flaw allows a malicious project to run unauthorized commands on a user's computer if they simply enter the project directory and list available tasks or use tab-completion. This bypasses the tool's built-in security prompts, potentially allowing an attacker to steal data or install malware when a user interacts with a downloaded repository.

Technologies: mise (crates.io). Vendors: crates.io.

Quick answers

Is CVE-2026-55441 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-55441 being exploited in the wild.
How severe is CVE-2026-55441?
High severity, with a CVSS score of 8.6, published 26 June 2026.
Which products and versions are affected?
mise (crates.io) < 2026.6.4, SEMVER:introduced=0,fixed=2026.6.4.
Is there a fix for CVE-2026-55441?
Yes. mise (crates.io): upgrade to 2026.6.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-55441 attacked?
It is attacked with local access, in a software library.
Am I affected by CVE-2026-55441?
Check whether you run mise (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • mise (crates.io): upgrade to 2026.6.4 or later
    cargo update -p mise

Technical details

A vulnerability exists in mise's task loading logic where task-include directories (e.g., mise-tasks/, .mise/tasks/) are processed without triggering the 'trust_check' mechanism if no primary config file (mise.toml) is present. The application uses the Tera templating engine to render task fields, which includes a registered 'exec()' function. An attacker can place a malicious Tera template, such as {{ exec(command='...') }}, inside a task's description or other fields. These commands are executed automatically when a user runs 'mise tasks', 'mise task ls', or even triggers shell completion (Tab) in the affected directory. The issue is fixed in version 2026.6.4 by ensuring trust checks are applied to all task-include paths.

Affected products

  • jdx mise < 2026.6.4

Identifiers

  • CVE-2026-55441
  • GHSA-77g9-363w-rccq

Timeline

  • 2026-06-12: advisory: GitHub security advisory published by vendor
  • 2026-06-26: disclosed: CVE published to NVD
  • 2026-06-26: patched: Fix released in version 2026.6.4

References

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