# CVE-2024-39918: @jmondi/url-to-png path traversal in image storage

Source: https://junglewise.ai/threats/cve-2024-39918-jmondi-url-to-png-path-traversal-in-image-storage  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2024-07-15. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2024-39918 · Severity: low · CVSS 3.1 · Published 2024-07-15

@jmondi/url-to-png is a Node.js library that converts URLs to PNG images and stores them on disk. A path traversal vulnerability allows attackers to write PNG files to arbitrary locations on the server's filesystem by injecting directory traversal sequences (such as `../`) into query parameters, potentially overwriting system files or placing malicious content outside the intended storage directory.

Technologies: [@jmondi/url-to-png (npm)](https://junglewise.ai/threats/technologies/jmondi-url-to-png). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2024-39918 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2024-39918 being exploited in the wild.

**How severe is CVE-2024-39918?** Low severity, with a CVSS score of 3.1, published 15 July 2024.

**Which products and versions are affected?** @jmondi/url-to-png (npm) SEMVER:introduced=0,fixed=2.1.2.

**Is there a fix for CVE-2024-39918?** Yes. @jmondi/url-to-png (npm): upgrade to 2.1.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2024-39918 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2024-39918?** Check whether you run @jmondi/url-to-png (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.

## How to fix

- @jmondi/url-to-png (npm): upgrade to 2.1.2 or later

  ```sh
  npm install @jmondi/url-to-png@2.1.2
  ```


## Technical details

The vulnerability exists in the image ID construction logic (extract_query_params.ts), where user-supplied query parameters are concatenated into a filesystem path without proper sanitization. Specifically, the `configToString()` function converts request parameters directly into the imageId string, which is later joined with the storage path using `path.join()`. An attacker can inject path traversal sequences (e.g., `../../../../tmp/hack`) via any non-numeric parameter to write files outside the intended storage directory. The vulnerability requires network access and no authentication; exploitation results in arbitrary file write capability on the filesystem. A patch was released in version 2.1.2 that applies the `slugify()` function to sanitize all parameters before path construction.

## Affected products

- Jason Raimondi @jmondi/url-to-png <2.1.2

## Identifiers

- CVE-2024-39918
- GHSA-vvmv-wrvp-9gjr

## Timeline

- 2024-07-15: disclosed
- 2024-07-15: patched: Fixed in version 2.1.2

## References

- [https://github.com/jasonraimondi/url-to-png/security/advisories/GHSA-vvmv-wrvp-9gjr](https://github.com/jasonraimondi/url-to-png/security/advisories/GHSA-vvmv-wrvp-9gjr)

## Related threats

- [jasonraimondi @jmondi/url-to-png SSRF via localhost screenshot capture](https://junglewise.ai/threats/cve-2024-39919-jasonraimondi-jmondi-url-to-png-ssrf-via-localhost-screenshot)
- [@jmondi/url-to-png arbitrary file read in screenshot feature](https://junglewise.ai/threats/cve-2024-37169-jmondi-url-to-png-arbitrary-file-read-in-screenshot-feature)