# CVE-2024-39008: robinweser fast-loops vulnerable to prototype pollution

> Attackers can execute arbitrary code or cause denial of service via prototype pollution in the fast-loops JavaScript library.

- **Severity:** Critical 10.0 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 1 Jul 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-3q56-9cc2-46j4

## What is CVE-2024-39008?

CVE-2024-39008 is a critical code injection vulnerability in n/a, published on 1 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

robinweser fast-loops v1.1.3 was discovered to contain a prototype pollution via the function objectMergeDeep. This vulnerability allows attackers to execute arbitrary code or cause a Denial of Service (DoS) via injecting arbitrary properties.

Weakness: CWE-1321 (Improperly Controlled Modification of Object Prototype Attributes)

## Which versions are affected by CVE-2024-39008?

2 open source packages ship an affected version, including fast-loops.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `fast-loops` | npm | All versions | 1.1.4 |
| `fast-loops` | npm | All versions | 1.1.4 |

## How do I fix CVE-2024-39008?

Upgrade fast-loops to 1.1.4 or later.

## Is CVE-2024-39008 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-39008 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-39008 and fix it if it is affected.

What it is: CVE-2024-39008 is a critical code injection vulnerability in n/a, published on 1 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-39008 exists.

Affected packages and fixed versions:
- fast-loops (npm): affected all versions; fixed in 1.1.4
- fast-loops (npm): affected all versions; fixed in 1.1.4

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-2024-39008/ (Markdown: https://insights.sbomify.com/CVE-2024-39008/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-39008
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-39008
- OSV: https://osv.dev/vulnerability/CVE-2024-39008

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-39008/
Summaries are generated and may contain mistakes; the official description above is the record.