Path Traversal in Pnpm
CVE-2026-55700
pnpm is a package manager. From 11.3.0 until 11.5.3, `pnpm stage download` derived a local filename from registry-controlled package name and version fields. A crafted manifest could escape the selected download directory and overwrite another reachable file. The merged fix validates both fields, derives one safe filename, and verifies the final destination before writing. This vulnerability is fixed in 11.5.3.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L.
EPSS exploit prediction
EPSS: 0.004 (33.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Pnpm — versions >= 11.3.0, < 11.5.3
Weakness classification (CWE)
References
- github.com/pnpm/pnpm/security/advisories/GHSA-v23m-ccfg-pq9h (Exploit, Vendor Advisory)
- github.com/pnpm/pnpm/pull/12303 (Patch)
Frequently asked questions
- What is CVE-2026-55700?
- CVE-2026-55700 is a high-severity vulnerability in Pnpm, classified under Path Traversal. CVSS score: 7.1/10. Published 2026-06-25.
- How severe is CVE-2026-55700?
- High severity. CVSS v3 base score is 7.1 out of 10.