What’s Vulnerable › Vulnerabilities

CVE-2026-39246

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-09 · updated 2026-07-13
• Weakness: CWE-59

Description

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.

Affected products

• Decompress Project Decompress: through 4.2.1

References

• https://github.com/kevva/decompress
• https://github.com/kevva/decompress/issues/114
• https://www.npmjs.com/package/decompress
• https://github.com/kevva/decompress/issues/114

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