CVE-2026-23888
Medium · 6.5pnpm: Binary ZIP extraction allows arbitrary file write via path traversal (Zip Slip)
CVSS
6.5
EPSS
0.5%
Published
Jan 26, 2026
CISA due date
—
The record
A path traversal vulnerability in pnpm's binary fetcher allows malicious packages to write files outside the intended extraction directory. The vulnerability has two attack vectors: (1) Malicious ZIP entries containing `../` or absolute paths that escape the extraction root via AdmZip's `extractAllTo`, and (2) The `BinaryResolution.prefix` field is concatenated into the extraction path without validation, allowing a crafted prefix like `../../evil` to redirect extracted files outside `targetDir`.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | pnpm | 0 | 10.28.1 |
Related vulnerabilities
- GHSA-6pfh-p556-v868 pnpm: Binary ZIP extraction allows arbitrary file write via path traversal (Zip Slip) Same vulnerability
- GHSA-v253-rj99-jwpq pnpm has Path Traversal via arbitrary file permission modification Also affects pnpm
- GHSA-6x96-7vc8-cm3p pnpm has Windows-specific tarball Path Traversal Also affects pnpm
- GHSA-xpqm-wm3m-f34h pnpm scoped bin name Path Traversal allows arbitrary file creation outside… Also affects pnpm
- GHSA-m733-5w8f-5ggw pnpm has symlink traversal in file:/git dependencies Also affects pnpm
- CVE-2026-24056 pnpm has symlink traversal in file:/git dependencies Also affects pnpm
- CVE-2026-23890 pnpm scoped bin name Path Traversal allows arbitrary file creation outside… Also affects pnpm
- CVE-2026-24131 pnpm has Path Traversal via arbitrary file permission modification Also affects pnpm