# CVE-2026-5023: DeDeveloper23 codebase-mcp RepoMix codebase.ts saveCodebase os command injection

> Local attackers can execute arbitrary OS commands via the saveCodebase function in the codebase-mcp developer tool.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Mar 2026
- **Updated:** 30 Mar 2026
- **Also known as:** GHSA-cm69-52gj-g4j6

## What is CVE-2026-5023?

CVE-2026-5023 is a medium-severity command injection vulnerability in DeDeveloper23 codebase-mcp, published on 29 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability has been found in DeDeveloper23 codebase-mcp up to 3ec749d237dd8eabbeef48657cf917275792fde6. This vulnerability affects the function getCodebase/getRemoteCodebase/saveCodebase of the file src/tools/codebase.ts of the component RepoMix Command Handler. Such manipulation leads to os command injection. The attack needs to be performed locally. The exploit has been disclosed to the public and may be used. This product implements a rolling release for ongoing delivery, which means version information for affected or updated releases is unavailable. The project was informed of the problem early through an issue report but has not responded yet.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command), CWE-77 (Improper Neutralization of Special Elements used in a Command)

## Which versions are affected by CVE-2026-5023?


## How do I fix CVE-2026-5023?

No fix has been published for CVE-2026-5023 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-5023 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5023 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5023 and fix it if it is affected.

What it is: CVE-2026-5023 is a medium-severity command injection vulnerability in DeDeveloper23 codebase-mcp, published on 29 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5023 exists.

Affected product: DeDeveloper23 codebase-mcp. 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-2026-5023/ (Markdown: https://insights.sbomify.com/CVE-2026-5023/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5023
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5023
- OSV: https://osv.dev/vulnerability/CVE-2026-5023

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-5023/
Summaries are generated and may contain mistakes; the official description above is the record.