CVE-2026-40931
8.4 · HIGHOverview
CVE-2026-40931 is a high-severity vulnerability affecting node-modules compressing. It was published on April 21, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from node-modules. Update compressing to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| node-modules | compressing | >= 0, < 1.10.5 | Affected |
Frequently Asked Questions
What is CVE-2026-40931?
CVE-2026-40931 is a high-severity vulnerability affecting node-modules compressing. It was published on April 21, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).
How severe is CVE-2026-40931?
This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-40931?
Check the references section for vendor advisories and patches from node-modules. Update compressing to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-40931?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-40931 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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