CVE-2026-40931

HIGH

Complete Bypass of CVE-2026-24884 Patch via Git-Delivered Symlink Poisoning in compressing

Title source: cna
STIX 2.1

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.

References (1)

Scores

CVSS v3 8.4
EPSS 0.0002
EPSS Percentile 4.9%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact total

Details

CWE
CWE-59
Status published
Products (2)
node-modules/compressing < 1.10.5 (2 CPE variants)
node-modules/compressing >=2.0.0, < 2.1.1
Published Apr 21, 2026
Tracked Since Apr 22, 2026