Vulnerability in Decompress Project
CVE-2026-39246
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.007 (49.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/kevva/decompress (Product)
- www.npmjs.com/package/decompress (Product)
- github.com/kevva/decompress/issues/114 (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-39246?
- CVE-2026-39246 is a high-severity vulnerability in Decompress Project, classified under Improper Link Resolution Before File Access. CVSS score: 7.5/10. Published 2026-07-09.
- How severe is CVE-2026-39246?
- High severity. CVSS v3 base score is 7.5 out of 10.