Symlink Attack Affecting compressing package, versions <1.10.5>=2.0.0 <2.1.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-JS-COMPRESSING-16108999
- published19 Apr 2026
- disclosed17 Apr 2026
- creditSachinPatil, IAMolofficial Amol
Introduced: 17 Apr 2026
NewCVE-2026-40931 (opens in a new tab)How to fix?
Upgrade compressing to version 1.10.5, 2.1.1 or higher.
Overview
compressing is an Everything you need for compressing and uncompressing
Affected versions of this package are vulnerable to Symlink Attack via the isPathWithinParent function. An attacker can overwrite arbitrary files outside the intended extraction directory by supplying a malicious archive and leveraging pre-existing symbolic links delivered through a git clone operation. This allows the attacker to redirect file writes to sensitive locations on the filesystem without user interaction beyond standard repository cloning and application execution.
Note: This vulnerability arises due to an incomplete fix for CVE-2026-24884.