CVE-2026-40931
HIGH
MEDIUM
Priority: 0.02
BB Relevance:
41/100
Published: 2026-04-21
Modified: 2026-10-26
First seen: 2026-10-29
Status: active
Attack Surface
Low Complexity
No Interaction
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
Low
UI:
None
S:
Unchanged
C:
High
I:
High
A:
High
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.
Weakness Classification (1)
Affected Software (1)
| Vendor | Product | Version |
|---|---|---|
| node-modules | compressing | < 1.10.5 |
References & Advisories (1)
Exploit
Mitigation
Vendor Advisory