# CVE-2026-15033: christopherthielen check-peer-dependencies peerDependencies packageUtils.js shelljs.exec os command injection

> Remote attackers can execute arbitrary OS commands via the shelljs.exec function in the check-peer-dependencies library.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Jul 2026
- **Updated:** 8 Jul 2026
- **Also known as:** GHSA-fmmh-7qjr-fp9g

## What is CVE-2026-15033?

CVE-2026-15033 is a medium-severity command injection vulnerability in christopherthielen check-peer-dependencies, published on 8 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A flaw has been found in christopherthielen check-peer-dependencies up to 4.3.4. Affected by this vulnerability is the function shelljs.exec of the file dist/packageUtils.js of the component peerDependencies. This manipulation causes os command injection. The attack may be initiated remotely. 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-2026-15033?


## How do I fix CVE-2026-15033?

No fix has been published for CVE-2026-15033 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-15033 being exploited?

There is no known exploitation of CVE-2026-15033 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15033 and fix it if it is affected.

What it is: CVE-2026-15033 is a medium-severity command injection vulnerability in christopherthielen check-peer-dependencies, published on 8 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-15033 in the wild and no public exploit code.

Affected product: christopherthielen check-peer-dependencies. 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-2026-15033/ (Markdown: https://insights.sbomify.com/CVE-2026-15033/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15033
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15033
- OSV: https://osv.dev/vulnerability/CVE-2026-15033

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-15033/
Summaries are generated and may contain mistakes; the official description above is the record.