# CVE-2022-37257: steal prototype pollution via requestedVersion

Source: https://junglewise.ai/threats/cve-2022-37257-steal-prototype-pollution-via-requestedversion  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-09-16. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2022-37257 · Severity: low · CVSS 3.1 · Published 2022-09-16

steal is an npm package used for JavaScript module loading and bundling. A prototype pollution vulnerability in the npm-convert.js file allows attackers to pollute the Object prototype by crafting a malicious requestedVersion variable, potentially enabling code execution or application compromise without authentication.

Technologies: [steal (npm)](https://junglewise.ai/threats/technologies/steal). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2022-37257 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2022-37257 being exploited in the wild.

**How severe is CVE-2022-37257?** Low severity, with a CVSS score of 3.1, published 16 September 2022.

**Which products and versions are affected?** steal (npm) SEMVER:introduced=0,last_affected=2.3.0.

**Is there a fix for CVE-2022-37257?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2022-37257 attacked?** It is attacked over the network.

**Am I affected by CVE-2022-37257?** Check whether you run steal (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This is a prototype pollution vulnerability (CWE-1321) in the convertLater function within npm-convert.js. The vulnerable component fails to properly validate the requestedVersion variable before using it in object assignment operations. The attack requires no authentication and is network-reachable if the application processes user-controlled version inputs. Successful exploitation pollutes the Object prototype, which can lead to arbitrary code execution or denial of service depending on how the polluted properties are leveraged by the application. All versions up to 2.3.0 are affected.

## Affected products

- stealjs steal up to 2.3.0

## Identifiers

- CVE-2022-37257
- GHSA-93q5-3xpc-8vg3

## Timeline

- 2022-09-16: disclosed
- 2022-09-15: other: NVD published

## References

- [https://github.com/stealjs/steal/issues/1526](https://github.com/stealjs/steal/issues/1526)

## Related threats

- [steal inefficient regular expression complexity in babel](https://junglewise.ai/threats/cve-2022-37259-steal-inefficient-regular-expression-complexity-in-babel)
- [steal prototype pollution via alias variable](https://junglewise.ai/threats/cve-2022-37265-steal-prototype-pollution-via-alias-variable)
- [steal prototype pollution in npm-convert.js](https://junglewise.ai/threats/cve-2022-37258-steal-prototype-pollution-in-npm-convert-js)
- [StealJS prototype pollution via babel.js](https://junglewise.ai/threats/cve-2022-37266-stealjs-prototype-pollution-via-babel-js)
- [StealJS ReDoS in main.js source variables](https://junglewise.ai/threats/cve-2022-37262-stealjs-redos-in-main-js-source-variables)