CVE-2026-40931

Severity CVSS v4.0:

Pending analysis

Type:

CWE-59 Link Following

Publication date:

21/04/2026

Last modified:

23/04/2026

Description

Compressing is a compressing and uncompressing lib for node. Prior to 2.1.1 and 1.10.5, the patch for CVE-2026-24884 relies on a purely logical string validation within the isPathWithinParent utility. This check verifies if a resolved path string starts with the destination directory string but fails to account for the actual filesystem state. By exploiting this "Logical vs. Physical" divergence, an attacker can bypass the security check using a Directory Poisoning technique (pre-existing symbolic links). This vulnerability is fixed in 2.1.1 and 1.10.5.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.40 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

8.40

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:node-modules:compressing::::::node.js::*		1.10.5 (excluding)
cpe:2.3:a:node-modules:compressing::::::node.js::*	2.0.0 (including)	2.1.1 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-40931

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools