Path Traversal Vulnerability in Compressing Library by Node Modules
CVE-2026-40931

8.4HIGH

Key Information:

Vendor

Node-modules

Status
Compressing
Vendor
CVE Published:
21 April 2026

What is CVE-2026-40931?

The Compressing library for Node.js contains a vulnerability that allows attackers to exploit a logical flaw in the isPathWithinParent utility. Prior to versions 2.1.1 and 1.10.5, the vulnerability arises from a validation function that only checks if a resolved path begins with a specified directory. This logical comparison does not consider the actual filesystem state, which can enable an attacker to execute a directory poisoning attack, potentially allowing access to unauthorized directories through pre-existing symbolic links. Users are advised to upgrade to the patched versions to mitigate this risk.

Affected Version(s)

compressing >=2.0.0, < 2.1.1 < 2.0.0, 2.1.1

compressing < 1.10.5 < 1.10.5

References

https://github.com/node-modules/compressing/security/advi...
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CVSS V3.1

Score:
8.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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