mise permits untrusted local configuration to override default shell arguments

Why it is Yellow

• CVSS 7.8 high
• Public exploit or proof of concept referenced

Affected packages

References

• https://github.com/advisories/GHSA-g74g-rg72-j2p3
• https://github.com/jdx/mise/security/advisories/GHSA-g74g-rg72-j2p3
• https://nvd.nist.gov/vuln/detail/CVE-2026-103929
• https://github.com/jdx/mise/pull/11293
• https://github.com/jdx/mise/commit/c6cd7a9a2ca580918562566126646e5d04317895
• https://github.com/jdx/mise/releases/tag/v2026.7.14
• https://github.com/advisories/GHSA-g74g-rg72-j2p3

Original description

mise manages dev tools like node, python, cmake, and terraform. Prior to 2026.7.14, in the default non-safe mode, mise loads .mise.toml [settings] from an untrusted local project before trust approval and strip_local_only_settings removes only fields marked global_only. The unix_default_file_shell_args, unix_default_inline_shell_args, windows_default_file_shell_args, and windows_default_inline_shell_args settings were not marked global_only, allowing a repository to replace the default interpreter arguments used by trusted tasks that have no explicit shell, postinstall directives, template exec operations, or hooks that fall back to the default shell. When mise appends the trusted command after the attacker-controlled interpreter arguments, the attacker-selected command can execute first with the developer account's privileges even though the local configuration was never trusted. The separate path-sanitization hardening note in the advisory is outside this vulnerability. This issue is fixed in version 2026.7.14.