jdx mise up to 2026.6.3 Environment Variable mise.toml os command injection

Summaryinfo

A vulnerability was found in jdx mise up to 2026.6.3. It has been rated as critical. The affected element is an unknown function of the file mise.toml of the component Environment Variable Handler. Performing a manipulation results in os command injection. This vulnerability is known as CVE-2026-55448. Attacking locally is a requirement. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in jdx mise up to 2026.6.3. It has been classified as critical. This affects an unknown function of the file mise.toml of the component Environment Variable Handler. The manipulation with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

mise manages dev tools like node, python, cmake, and terraform. From 2026.3.15 until 2026.6.4, mise loads github.credential_command from local project config before any trust decision, then executes that value with sh -c when resolving a GitHub token. An attacker who can place a .mise.toml in a repository can execute arbitrary shell commands when the victim runs a GitHub-related mise command and no higher-priority GitHub token environment variable is set. This vulnerability is fixed in 2026.6.4.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-55448 since 06/16/2026. The exploitability is told to be difficult. An attack has to be approached locally. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1202 for this issue.

Upgrading to version 2026.6.4 eliminates this vulnerability.

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Productinfo

Vendor

• jdx

Name

• mise

Version

• 2026.6.0
• 2026.6.1
• 2026.6.2
• 2026.6.3

Website

• Product: https://github.com/jdx/mise/

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