CVE-2026-40931CWE-59

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

High · published April 21, 2026

CVSS v3.1
8.4
EPSS
0%
Percentile
12.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.4 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00222 · 12.0th percentile
Weakness
CWE-59 · Improper Link Resolution Before File Access ('Link Following')
Published
2026-04-21T20:57Z
EPSS history
Timeline
  • 21 APR 20:57Z
    Complete Bypass of CVE-2026-24884 Patch via Git-Delivered Symlink Poisoning in compressing
    cvelistv5