CVE-2026-40931
Last modified
CVE-2026-40931 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.24% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Node-Modules | Compressing | < 1.10.5 |
| Node-Modules | Compressing | >= 2.0.0, < 2.1.1 |
References
- https://github.com/node-modules/compressing/security/advisories/GHSA-4c3q-x735-j3r5Exploit, Mitigation, Vendor Advisory
- https://github.com/node-modules/compressing/security/advisories/GHSA-4c3q-x735-j3r5Exploit, Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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