CVE-2026-54557 mise HTTP backend uses raw version path for install symlink destination
Attackers can use a malicious .tool-versions file to create symlinks outside the install directory, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-54557?
CVE-2026-54557 is a medium-severity path traversal vulnerability in jdx mise, published on 26 Jun 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 2026.6.1, the mise HTTP backend builds its install symlink destination from the raw resolved version string for non-latest versions. Normal tool install paths use the sanitized version pathname, but the HTTP backend's symlink path uses the raw value. On Unix-like systems, if that version is an absolute path, PathBuf::join discards the intended mise installs root. A repository-controlled .tool-versions file can therefore make mise install create a symlink outside the mise install tree. With bin_path, the same issue can place an executable symlink under an attacker-selected absolute prefix, such as a developer-tool prefix that is later added to PATH. This vulnerability is fixed in 2026.6.1.
Weakness: CWE-22
Which versions are affected by CVE-2026-54557?
2 open source packages ship an affected version, including mise.
| Package | Affected | Fixed in |
|---|---|---|
mise crates.io | All versions | 2026.6.1 |
mise crates.io | All versions | 2026.6.1 |
How do I fix CVE-2026-54557?
Upgrade mise to 2026.6.1 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-54557 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54557 exists.
Sources
Also known as GHSA-f94h-j2qg-fxw3.