# CVE-2026-71477: mise: Incorrect file ownership, when installed by the root user using `install.sh`

> Local attackers can replace root-installed executables due to incorrect file ownership, enabling privilege escalation and code execution.

- **Severity:** Medium 6.7 (`CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 18 Aug 2026
- **Updated:** 18 Aug 2026
- **Also known as:** GHSA-9mm4-fgvc-x7rp

## What is CVE-2026-71477?

CVE-2026-71477 is a medium-severity vulnerability in jdx mise, published on 18 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

mise manages dev tools like node, python, cmake, and terraform. Prior to 2026.7.1, release tar archives record mise/bin/mise with user and group ID 1001 and packaging/standalone/install.envsubst extracts and moves it without normalizing ownership, allowing a local user with those IDs to replace a root-installed executable, especially when MISE_INSTALL_PATH targets a shared location such as /usr/local/bin. This issue is fixed in version 2026.7.1.

Weakness: CWE-278 (Insecure Preserved Inherited Permissions)

## Which versions are affected by CVE-2026-71477?


## How do I fix CVE-2026-71477?

No fix has been published for CVE-2026-71477 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-71477 being exploited?

There is no known exploitation of CVE-2026-71477 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-71477 and fix it if it is affected.

What it is: CVE-2026-71477 is a medium-severity vulnerability in jdx mise, published on 18 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-71477 in the wild and no public exploit code.

Affected product: jdx mise. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-71477/ (Markdown: https://insights.sbomify.com/CVE-2026-71477/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-71477
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-71477
- OSV: https://osv.dev/vulnerability/CVE-2026-71477

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-71477/
Summaries are generated and may contain mistakes; the official description above is the record.