CVE-2026-55448: mise: Local credential_command executes untrusted config

Severity: medium (CVSS 6.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-26 · updated 2026-10-25
Weakness: CWE-78

Description

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.

Affected products

jdx mise: before 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

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