High severity8.4NVD Advisory· Published Apr 21, 2026· Updated Apr 23, 2026
CVE-2026-40931
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
compressingnpm | >= 2.0.0, < 2.1.1 | 2.1.1 |
compressingnpm | < 1.10.5 | 1.10.5 |
Affected products
2Patches
Vulnerability mechanics
References
3- github.com/node-modules/compressing/security/advisories/GHSA-4c3q-x735-j3r5nvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-4c3q-x735-j3r5ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-40931ghsaADVISORY
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