CVE-2026-39243
CVE-2026-39243
This page contains facts from public vulnerability sources. Check the original advisory before updating.
decompress before 4.2.2 allows arbitrary hardlink creation during archive extraction, enabling file read disclosure and file corruption. When processing hardlink entries (type === 'link'), the x.linkname field from the archive is passed directly to fs.link() without validation (index.js line 113). An attacker can craft an archive with a hardlink entry whose linkname is an absolute path to any file on the same filesystem. This creates a hardlink inside the extraction directory that shares the same inode as the target file, enabling both reading and overwriting the original file's content. Hardlinks are limited to files on the same filesystem and cannot target directories.
CVSS 5.5 · Medium · EPSS 0.3%
- Published
- Updated
Stack: node
Affected products and versions
n/a
- Versions
- n/a: Affected
No fix published
decompress npm
- Affected ranges
- SEMVER: ≤ 4.2.1
No fix published