EUVD-2026-42770
GHSA-m5fg-qjq5-56fv
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Primary rating from Vendor (mitre) · only source for this CVE.
CVSS VectorVendor: mitre
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
3DescriptionCVE.org
decompress before 4.2.2 allows arbitrary symlink creation during archive extraction. When processing symlink entries (type === 'symlink'), the x.linkname field from the archive is passed directly to fs.symlink() without validation (index.js line 121). The preventWritingThroughSymlink check on line 98 only applies to file entries, not symlink creation. An attacker can craft an archive with symlink entries pointing to sensitive files outside the extraction directory (e.g., /etc/passwd), enabling information disclosure when the application reads the extracted contents.
AnalysisAI
Arbitrary symlink creation in the decompress npm package before 4.2.2 lets an attacker who supplies a crafted archive plant symlinks pointing outside the extraction directory, leading to information disclosure when the host application reads the extracted contents. The flaw stems from a symlink entry's linkname being passed straight to fs.symlink() without validation, while the existing anti-symlink guard only protects regular file entries. …
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Within 24 hours: Inventory all systems and applications using the decompress package; document versions and prioritize business-critical instances. …
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Same weakness CWE-59 – Improper Link Resolution Before File Access
View allSame technique Information Disclosure
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External POC / Exploit Code
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