CVE-2026-55700

HIGH

pnpm: stage download writes outside destination via manifest version traversal

Title source: cna
STIX 2.1

Description

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.

References (2)

Core 2
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/pnpm/pnpm/pull/12303

Scores

CVSS v3 7.1
EPSS 0.0027
EPSS Percentile 18.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-22 CWE-73
Status published
Products (3)
npm/pnpm 11.3.0 - 11.5.3npm
pnpm/pnpm 11.3.0 - 11.5.3
pnpm/pnpm >= 11.3.0, < 11.5.3
Published Jun 25, 2026
Tracked Since Jun 25, 2026