CVE-2026-40931 — Complete Bypass of CVE-2026-24884 Patch via Git-Delivered Symlink Poisoning in compressing
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 isPa…
Published: 2026-04-21 · CVSS: 8.4 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7