# CVE-2026-55448: jdx mise OS command injection in github.credential_command

Source: https://junglewise.ai/threats/cve-2026-55448-jdx-mise-os-command-injection-in-github-credential-command  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-26. Updated: 2026-06-26  
License: CC BY 4.0 with a link back

CVE-2026-55448 · Severity: medium · CVSS 6.3 · Published 2026-06-26

mise, a tool for managing development environments like Node.js and Python, contains a security flaw that allows for unauthorized command execution. If a user opens a project containing a malicious configuration file and runs certain commands, the attacker can execute arbitrary code on the user's computer. This could lead to the theft of sensitive data or full system compromise.

Technologies: [mise (crates.io)](https://junglewise.ai/threats/technologies/mise). Vendors: [crates.io](https://junglewise.ai/threats/vendors/crates-io).

## Quick answers

**Is CVE-2026-55448 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-55448 being exploited in the wild.

**How severe is CVE-2026-55448?** Medium severity, with a CVSS score of 6.3, published 26 June 2026.

**Which products and versions are affected?** mise (crates.io) >= 2026.3.15, < 2026.6.4, SEMVER:introduced=2026.3.15,fixed=2026.6.4.

**Is there a fix for CVE-2026-55448?** 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-2026-55448 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-55448?** 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

  ```sh
  cargo update -p mise
  ```


## Technical details

A command injection vulnerability exists in mise versions 2026.3.15 through 2026.6.3. The application improperly loads the 'github.credential_command' setting from local '.mise.toml' project files without performing a trust check. When mise attempts to resolve a GitHub token and no higher-priority environment variables (like GITHUB_TOKEN) are set, it executes the value of this setting using 'sh -c'. An attacker can exploit this by placing a malicious '.mise.toml' file in a repository; when a victim runs a GitHub-related mise command within that directory, the attacker's commands are executed with the victim's privileges. This has been fixed in version 2026.6.4 by ignoring this setting in non-global configuration files.

## Affected products

- jdx mise >= 2026.3.15, < 2026.6.4

## Identifiers

- CVE-2026-55448
- GHSA-29hf-rm4x-xxph

## Timeline

- 2026-06-12: advisory: GitHub advisory published by vendor
- 2026-06-26: disclosed: CVE published to NVD
- 2026-06-04: patched: Fixed in version 2026.6.4

## References

- [https://github.com/jdx/mise/security/advisories/GHSA-29hf-rm4x-xxph](https://github.com/jdx/mise/security/advisories/GHSA-29hf-rm4x-xxph)

## Related threats

- [mise untrusted local configuration shell argument injection](https://junglewise.ai/threats/cve-2026-103929-mise-permits-untrusted-local-configuration-to-override-default)
- [jdx mise arbitrary command execution via task-include files](https://junglewise.ai/threats/cve-2026-55441-jdx-mise-arbitrary-command-execution-via-task-include-files)
- [jdx mise path traversal in HTTP backend symlink creation](https://junglewise.ai/threats/cve-2026-54557-jdx-mise-path-traversal-in-http-backend-symlink-creation)
- [jdx mise arbitrary command execution in .tool-versions parsing](https://junglewise.ai/threats/cve-2026-33646-jdx-mise-arbitrary-command-execution-in-tool-versions-parsing)
- [jdx mise trust check bypass in local configuration files](https://junglewise.ai/threats/cve-2026-35533-jdx-mise-trust-check-bypass-in-local-configuration-files)