mise: Local credential_command executes untrusted config

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No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

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.

Source published

26 Jun 2026 16:46:17 UTC

Source modified

27 Jun 2026 02:47:55 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

CVE Program Terms of Use

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CVSS 3.1 · 6.3 CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

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.

Source published

Jun 26, 2026, 4:46:17 PM (timezone not stated)

Source modified

Jun 27, 2026, 2:47:55 AM (timezone not stated)

Observed here

7 Nov 2026 12:32:06 UTC

Source terms

ENISA EUVD · source terms and attribution apply

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EUVD CVSS 3.1 · 6.3 CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

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.

Source published

26 Jun 2026 18:17:01 UTC

Source modified

25 Oct 2026 17:10:00 UTC

Observed here

27 Oct 2026 14:13:40 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 6.3 CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

### Summary `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. The current command-execution path is `github.credential_command`. I confirmed in Docker that the setting is exploitable on `v2026.3.15` and `v2026.3.17`, while `v2026.3.14` rejects it as an unknown field. This report does not depend on the separate trust-bypass issue because the sink is reached directly from `[settings.github]`. ### Details The vulnerable load order is: 1. [`Settings::try_get()`](https://github.com/jdx/mise/blob/37997e70cd2216d1a86726fba0c8c09c3986ad06/src/config/settings.rs#L254-L283) preloads settings from local config files. 2. [`parse_settings_file()`](https://github.com/jdx/mise/blob/37997e70cd2216d1a86726fba0c8c09c3986ad06/src/config/settings.rs#L505-L510) returns `settings_file.settings` without checking whether the local file is trusted. 3. [`resolve_token()`](https://github.com/jdx/mise/blob/37997e70cd2216d1a86726fba0c8c09c3986ad06/src/github.rs#L344-L390) checks `settings.github.credential_command` after the token env vars and before file-based sources. 4. [`get_credential_command_token()`](https://github.com/jdx/mise/blob/37997e70cd2216d1a86726fba0c8c09c3986ad06/src/github.rs#L558-L599) executes the value with `sh -c`. The main command-execution path is: ```rust let result = std::process::Command::new("sh") .arg("-c") .arg(cmd) .arg("mise-credential-helper") .arg(host) .output() ``` If a local project file sets: ```toml [settings.github] credential_command = "echo credential_command_rce > /tmp/mise-proof.txt; echo ghp_fake_token" ``` then `resolve_token()` will reach `get_credential_command_token()` whenever higher-priority GitHub token environment variables are unset. `credential_command` is a documented custom credential source for mise, but it is also accepted from a local project `.mise.toml`, which lets an untrusted repository supply a shell command for mise to execute. ### PoC Test environment: - Docker - `linux-arm64` - `mise v2026.3.17` Negative control: ```bash export GITHUB_TOKEN=env_token mise github token --unmask ``` Observed: ```text github.com: env_token (source: GITHUB_TOKEN) /tmp/mise-proof.txt => missing ``` Primary exploit: ```toml [settings.github] credential_command = "echo credential_command_rce > /tmp/mise-proof.txt; echo ghp_fake_token" ``` Run: ```bash unset GITHUB_TOKEN GITHUB_API_TOKEN MISE_GITHUB_TOKEN MISE_GITHUB_ENTERPRISE_TOKEN mise github token --unmask ``` Observed: ```text github.com: ghp_fake_token (source: credential_command) ``` And the side effect file is created: ```text /tmp/mise-proof.txt => credential_command_rce ``` Related version check: - `v2026.3.14`: `credential_command` is rejected as an unknown field - `v2026.3.15`: the same PoC executes and returns `source: credential_command` ### Impact An attacker who can place a `.mise.toml` in a repository can execute arbitrary shell commands as the victim user when the victim runs a mise command that resolves a GitHub token from local settings. Demonstrated impact: - arbitrary command execution as the victim user - no trust prompt - no need for `[env]`, `[hooks]`, tasks, or templates Important limitation: - if a higher-priority GitHub token environment variable is already set, the `credential_command` path is not reached ### Suggested Fix Do not honor `github.credential_command` from non-global project config files. For example, inside `parse_settings_file()`: ```rust pub fn parse_settings_file(path: &Path) -> Result<SettingsPartial> { let raw = file::read_to_string(path)?; let settings_file: SettingsFile = toml::from_str(&raw)?; let mut settings = settings_file.settings; if !config::is_global_config(path) { settings.github.credential_command = None; } Ok(settings) } ```

Source published

23 Jun 2026 18:24:28 UTC

Source modified

3 Nov 2026 20:30:03 UTC

Observed here

3 Nov 2026 20:59:08 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Publisher rating · MODERATE