# CVE-2024-30254: Directory traversal allowing overwriting arbitrary files

> An attacker can overwrite arbitrary files by tricking a victim into running the MesonLSP language server on a crafted project or with specific flags.

- **Severity:** Medium 5.8 (`CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L`)
- **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:** No
- **Published:** 4 Apr 2024
- **Updated:** 26 Aug 2024
- **Also known as:** GHSA-48c5-35fh-846h

## What is CVE-2024-30254?

CVE-2024-30254 is a medium-severity path traversal vulnerability in JCWasmx86 mesonlsp, published on 4 Apr 2024. 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

MesonLSP is an unofficial, unendorsed language server for meson written in C++. A vulnerability in versions prior to 4.1.4 allows overwriting arbitrary files if the attacker can make the victim either run the language server within a specific crafted project or `mesonlsp --full`. Version 4.1.4 contains a patch for this issue. As a workaround, avoid running `mesonlsp --full` and set the language server option `others.neverDownloadAutomatically` to `true`.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2024-30254?


## How do I fix CVE-2024-30254?

No fix has been published for CVE-2024-30254 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-30254 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-30254 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-30254 and fix it if it is affected.

What it is: CVE-2024-30254 is a medium-severity path traversal vulnerability in JCWasmx86 mesonlsp, published on 4 Apr 2024. 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-30254 exists.

Affected product: JCWasmx86 mesonlsp. 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-2024-30254/ (Markdown: https://insights.sbomify.com/CVE-2024-30254/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-30254
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-30254
- OSV: https://osv.dev/vulnerability/CVE-2024-30254

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-30254/
Summaries are generated and may contain mistakes; the official description above is the record.