Vulnerability-Lookup

CVE-2026-103929 (GCVE-0-2026-103929)

Vulnerability from cvelistv5 – Published: 2026-10-14 15:11 – Updated: 2026-10-15 19:11

Title

mise permits untrusted local configuration to override default shell arguments

Summary

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.

Severity

7.8 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-15 19:11 UTC

CWE

CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-284 - Improper Access Control

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/jdx/mise/security/advisories/G…	x_refsource_CONFIRM
https://github.com/jdx/mise/pull/11293	x_refsource_MISC
https://github.com/jdx/mise/commit/c6cd7a9a2ca580…	x_refsource_MISC
https://github.com/jdx/mise/releases/tag/v2026.7.14	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
jdx	mise	Affected: < 2026.7.14	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-103929

Vulnerability from fkie_nvd - Published: 2026-10-14 16:17 - Updated: 2026-10-15 19:17

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/jdx/mise/commit/c6cd7a9a2ca580918562566126646e5d04317895
	security-advisories@github.com	https://github.com/jdx/mise/pull/11293
	security-advisories@github.com	https://github.com/jdx/mise/releases/tag/v2026.7.14
	security-advisories@github.com	https://github.com/jdx/mise/security/advisories/GHSA-g74g-rg72-j2p3
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/jdx/mise/security/advisories/GHSA-g74g-rg72-j2p3

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    }
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GHSA-G74G-RG72-J2P3

Vulnerability from github – Published: 2026-10-15 20:16 – Updated: 2026-10-15 20:16

Summary

mise permits untrusted local configuration to override default shell arguments

Details

Summary

Untrusted local .mise.toml [settings] can set the shell interpreter args (unix/windows default_inline / default_file shell_args), yielding arbitrary command execution, because those command-interpreter settings were not added to the global_only denylist the CVE-2026-55448 fix relies on. Code execution from an untrusted repository with no trust prompt for the malicious file, on par with the patched CVE. Confirmed at HEAD 7160170206782fdd3ef287c8302369e32152fb71.

The defect

CVE-2026-55448 and CVE-2026-35533 fixed the fact that a local project [settings] table is harvested by the settings preloader independent of the trust store (an untrusted .mise.toml sets settings without the user ever trusting it). The remediation is a per-field global_only denylist: settings marked global_only are stripped from non-global config. The maintainers marked the command-execution fields they knew about (the three forge credential_command values) but did not mark the four shell-interpreter-args settings, which are also command-execution settings because they choose the interpreter for every command mise spawns.

The global_only denylist and the gap. In settings.toml, the three credential_command sinks are global_only (forgejo.credential_command around line 775, github.credential_command around 828, gitlab.credential_command around 990). The four shell-args settings do not carry global_only:

unix_default_file_shell_args (settings.toml around 2920)
unix_default_inline_shell_args (around 2926)
windows_default_file_shell_args (around 3004)
windows_default_inline_shell_args (around 3010)

The strip logic only removes global_only keys. src/config/settings.rs strip_local_only_settings (line 409) filters by meta.global_only (line 416: filter_map(|(key, meta)| meta.global_only.then_some(*key))), so any field not marked global_only survives from a local untrusted config. The settings preload loads every config path including the local project file (all_settings_files, line 778), and in default (non-safe) mode there is no trust check (safe_mode defaults false, line 1141).

The sink. src/config/settings.rs default_inline_shell (line 1032) reads self.unix_default_inline_shell_args (line 1040), and default_file_shell reads unix_default_file_shell_args. Settings::get returns the merged global-plus-local value minus global_only, so the untrusted project value overrides the built-in default (sh -c -o errexit).

Injection semantics. The real command is appended after the attacker's args, so PAYLOAD runs and the real command is demoted to $0:

tera inline exec builtin: src/tera.rs (tera1_exec around 1358, and around 1470) builds shell[1..] + [command] with program = shell[0]. An attacker unix_default_inline_shell_args = "sh -c 'PAYLOAD'" yields sh -c 'PAYLOAD' .
postinstall runner: src/backend/mod.rs around 2405 calls cmd_body_args(shell_args, body); src/cmd.rs cmd_body_args (non-Windows, around 520) returns program flags... body, the same demotion.
task execution: src/task/task_executor.rs (around 916, 939, 993) uses task.shell()?.unwrap_or(default_inline_shell()/default_file_shell()), so a trusted task with no explicit shell (the common case) runs through the attacker's interpreter.
hooks: src/hooks.rs (around 540, 603) also fall back to default_inline_shell().

Attacker model and reachability

An untrusted repository the developer clones and cd's into. The attacker's .mise.toml sits in the working directory or any ancestor and is never trusted by the victim; its [settings] table is harvested by the preloader independent of the trust store, exactly as the two prior CVEs established. The executed command can come from a trusted or global source; only the interpreter is attacker-controlled. Any of these, run while the untrusted .mise.toml is in an ancestor directory, fires it: mise run for a task defined in the global config or a trusted parent repo (inline run, no explicit shell); mise install of any tool with a postinstall directive; any tera template that calls exec(...) in the victim's own trusted or global config; a directory-enter hook from any trusted config in scope.

Proof of concept. In an untrusted repo, .mise.toml:

[settings]
unix_default_inline_shell_args = "sh -c 'id > /tmp/mise_pwned'"

The victim cd's in (does not trust the file) and later runs any global or trusted-parent task with no explicit shell, or mise install of a tool with a postinstall, or a config that renders {{ exec(...) }}. mise builds sh -c 'id > /tmp/mise_pwned' <realcommand>, so the payload runs.

Verification

Source-verified at HEAD: the four shell-args settings lack global_only while the credential_command sinks have it, strip_local_only_settings removes only global_only keys, default_inline_shell reads the setting, and the exec/postinstall/task paths append the real command after the attacker args. The load path is the same one two shipped CVEs already proved reachable. I did not run mise end to end.

Suggested fix

Mark all four default_shell_args settings global_only = true (the same treatment as credential_command), or flip the default-mode policy to an allowlist so any setting not explicitly known-safe is stripped from non-global config.

Secondary note (weaker, not the main finding): the CVE-2026-54557 path-sanitization fix added sanitize_install_version_name only inside the HTTP backend (src/backend/http.rs around 628), while the general path builder ToolVersion::tv_pathname (src/toolset/tool_version.rs around 292) still only replaces ':' and '/' and does not neutralize '..' or backslash. Impact is narrow (one level up, stays in the mise data dir on Unix), so this is a hardening note, not a primary finding.

Tooling

AI assistance was used while investigating, but the researcher read strip_local_only_settings (confirming it strips only global_only), the settings.toml entries (confirming the four shell-args settings lack global_only while credential_command has it), default_inline_shell (confirming it reads the setting), and the exec/postinstall/task invocation sites (confirming the real command is appended after the attacker args) themself at HEAD, so the incomplete fix is source-verified.

Severity

7.8 (High)


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

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2026.7.13"
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "mise"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2026.7.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-103929"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-284",
      "CWE-78"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-15T20:16:09Z",
    "nvd_published_at": "2026-10-14T16:17:30Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\nUntrusted local .mise.toml [settings] can set the shell interpreter args (unix/windows default_inline / default_file shell_args), yielding arbitrary command execution, because those command-interpreter settings were not added to the global_only denylist the CVE-2026-55448 fix relies on. Code execution from an untrusted repository with no trust prompt for the malicious file, on par with the patched CVE. Confirmed at HEAD 7160170206782fdd3ef287c8302369e32152fb71.\n\n## The defect\n\nCVE-2026-55448 and CVE-2026-35533 fixed the fact that a local project [settings] table is harvested by the settings preloader independent of the trust store (an untrusted .mise.toml sets settings without the user ever trusting it). The remediation is a per-field global_only denylist: settings marked global_only are stripped from non-global config. The maintainers marked the command-execution fields they knew about (the three forge credential_command values) but did not mark the four shell-interpreter-args settings, which are also command-execution settings because they choose the interpreter for every command mise spawns.\n\nThe global_only denylist and the gap. In settings.toml, the three credential_command sinks are global_only (forgejo.credential_command around line 775, github.credential_command around 828, gitlab.credential_command around 990). The four shell-args settings do not carry global_only:\n\n- unix_default_file_shell_args (settings.toml around 2920)\n- unix_default_inline_shell_args (around 2926)\n- windows_default_file_shell_args (around 3004)\n- windows_default_inline_shell_args (around 3010)\n\nThe strip logic only removes global_only keys. src/config/settings.rs strip_local_only_settings (line 409) filters by meta.global_only (line 416: `filter_map(|(key, meta)| meta.global_only.then_some(*key))`), so any field not marked global_only survives from a local untrusted config. The settings preload loads every config path including the local project file (all_settings_files, line 778), and in default (non-safe) mode there is no trust check (safe_mode defaults false, line 1141).\n\nThe sink. src/config/settings.rs default_inline_shell (line 1032) reads self.unix_default_inline_shell_args (line 1040), and default_file_shell reads unix_default_file_shell_args. Settings::get returns the merged global-plus-local value minus global_only, so the untrusted project value overrides the built-in default (sh -c -o errexit).\n\nInjection semantics. The real command is appended after the attacker\u0027s args, so PAYLOAD runs and the real command is demoted to $0:\n\n- tera inline exec builtin: src/tera.rs (tera1_exec around 1358, and around 1470) builds shell[1..] + [command] with program = shell[0]. An attacker unix_default_inline_shell_args = \"sh -c \u0027PAYLOAD\u0027\" yields sh -c \u0027PAYLOAD\u0027 \u003ccommand\u003e.\n- postinstall runner: src/backend/mod.rs around 2405 calls cmd_body_args(shell_args, body); src/cmd.rs cmd_body_args (non-Windows, around 520) returns program flags... body, the same demotion.\n- task execution: src/task/task_executor.rs (around 916, 939, 993) uses task.shell()?.unwrap_or(default_inline_shell()/default_file_shell()), so a trusted task with no explicit shell (the common case) runs through the attacker\u0027s interpreter.\n- hooks: src/hooks.rs (around 540, 603) also fall back to default_inline_shell().\n\n## Attacker model and reachability\n\nAn untrusted repository the developer clones and cd\u0027s into. The attacker\u0027s .mise.toml sits in the working directory or any ancestor and is never trusted by the victim; its [settings] table is harvested by the preloader independent of the trust store, exactly as the two prior CVEs established. The executed command can come from a trusted or global source; only the interpreter is attacker-controlled. Any of these, run while the untrusted .mise.toml is in an ancestor directory, fires it: mise run \u003ctask\u003e for a task defined in the global config or a trusted parent repo (inline run, no explicit shell); mise install of any tool with a postinstall directive; any tera template that calls exec(...) in the victim\u0027s own trusted or global config; a directory-enter hook from any trusted config in scope.\n\nProof of concept. In an untrusted repo, .mise.toml:\n\n```toml\n[settings]\nunix_default_inline_shell_args = \"sh -c \u0027id \u003e /tmp/mise_pwned\u0027\"\n```\n\nThe victim cd\u0027s in (does not trust the file) and later runs any global or trusted-parent task with no explicit shell, or mise install of a tool with a postinstall, or a config that renders {{ exec(...) }}. mise builds `sh -c \u0027id \u003e /tmp/mise_pwned\u0027 \u003crealcommand\u003e`, so the payload runs.\n\n## Verification\n\nSource-verified at HEAD: the four shell-args settings lack global_only while the credential_command sinks have it, strip_local_only_settings removes only global_only keys, default_inline_shell reads the setting, and the exec/postinstall/task paths append the real command after the attacker args. The load path is the same one two shipped CVEs already proved reachable. I did not run mise end to end.\n\n## Suggested fix\n\nMark all four *_default_*_shell_args settings global_only = true (the same treatment as credential_command), or flip the default-mode policy to an allowlist so any setting not explicitly known-safe is stripped from non-global config.\n\nSecondary note (weaker, not the main finding): the CVE-2026-54557 path-sanitization fix added sanitize_install_version_name only inside the HTTP backend (src/backend/http.rs around 628), while the general path builder ToolVersion::tv_pathname (src/toolset/tool_version.rs around 292) still only replaces \u0027:\u0027 and \u0027/\u0027 and does not neutralize \u0027..\u0027 or backslash. Impact is narrow (one level up, stays in the mise data dir on Unix), so this is a hardening note, not a primary finding.\n\n## Tooling\n\nAI assistance was used while investigating, but the researcher read strip_local_only_settings (confirming it strips only global_only), the settings.toml entries (confirming the four shell-args settings lack global_only while credential_command has it), default_inline_shell (confirming it reads the setting), and the exec/postinstall/task invocation sites (confirming the real command is appended after the attacker args) themself at HEAD, so the incomplete fix is source-verified.",
  "id": "GHSA-g74g-rg72-j2p3",
  "modified": "2026-10-15T20:16:09Z",
  "published": "2026-10-15T20:16:09Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/jdx/mise/security/advisories/GHSA-g74g-rg72-j2p3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103929"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jdx/mise/pull/11293"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jdx/mise/commit/c6cd7a9a2ca580918562566126646e5d04317895"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/jdx/mise"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jdx/mise/releases/tag/v2026.7.14"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "mise permits untrusted local configuration to override default shell arguments"
}

Sightings

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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CVE-2026-103929 (GCVE-0-2026-103929)

FKIE_CVE-2026-103929

GHSA-G74G-RG72-J2P3

Summary

The defect

Attacker model and reachability

Verification

Suggested fix

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