CVE-2026-40931
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.
How to fix
- node-modules compressing1.10.5, 2.1.1 or later
- compressing2.1.1, 1.10.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| node-modules compressing | v < 1.10.5, 2.0.0 ≤ v < 2.1.1 | 1.10.5, 2.1.1 |
| compressingnpm | 2.0.0 ≤ v < 2.1.1, v < 1.10.5 | 2.1.1, 1.10.5 |
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Attack Surface Management
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