# CVE-2024-23339: hoolock does not block Prototype pollution with object-path related utilities

> Prototype pollution in hoolock allows attackers to modify object prototypes, potentially leading to code execution or privilege escalation.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 22 Jan 2024
- **Updated:** 17 Jun 2025
- **Also known as:** GHSA-4c2g-hx49-7h25

## What is CVE-2024-23339?

CVE-2024-23339 is a medium-severity vulnerability in elijahharry hoolock, published on 22 Jan 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

hoolock is a suite of lightweight utilities designed to maintain a small footprint when bundled. Starting in version 2.0.0 and prior to version 2.2.1, utility functions related to object paths (`get`, `set`, and `update`) did not block attempts to access or alter object prototypes. Starting in version 2.2.1, the `get`, `set` and `update` functions throw a `TypeError` when a user attempts to access or alter inherited properties.

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

## Which versions are affected by CVE-2024-23339?

2 open source packages ship an affected version, including hoolock. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `hoolock` | npm | From 2.0.0 | 2.2.1 |
| `hoolock` | npm | From 2.0.0 | 2.2.1 |

Products: Elijahharry Hoolock.

## How do I fix CVE-2024-23339?

Upgrade hoolock to 2.2.1 or later.

## Is CVE-2024-23339 being exploited?

There is no known exploitation of CVE-2024-23339 in the wild and no public exploit code.

Public exploit code:

- pp (github_poc): https://github.com/200101WhoAmI/CVE-2024-23339

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-23339 and fix it if it is affected.

What it is: CVE-2024-23339 is a medium-severity vulnerability in elijahharry hoolock, published on 22 Jan 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2024-23339 in the wild and no public exploit code.

Affected packages and fixed versions:
- hoolock (npm): affected from 2.0.0; fixed in 2.2.1
- hoolock (npm): affected from 2.0.0; fixed in 2.2.1

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-2024-23339/ (Markdown: https://insights.sbomify.com/CVE-2024-23339/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-23339
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-23339
- OSV: https://osv.dev/vulnerability/CVE-2024-23339

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-23339/
Summaries are generated and may contain mistakes; the official description above is the record.