CVE-2026-55699

Description

pnpm is a package manager. Prior to 10.34.2 and 11.5.3, Manifest bin object keys such as "", ".", and ".." passed pnpm's bin-name guard. When a malicious package was installed globally, later global remove, update, or add-replacement flows could re-derive those names from the installed manifest and pass path.join(globalBinDir, binName) to removeBin. For "." this targets the global bin directory; for ".." this targets its parent. This vulnerability is fixed in 10.34.2 and 11.5.3.

CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0029

Probability of exploitation

0.20%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-22 Path Traversal

CWE-73 CWE-73

Affected Products

Vendor	Product	Versions
pnpm	pnpm	< 10.34.2
pnpm	pnpm	11.0.0 — 11.5.3

References

Advisories & Patches

https://github.com/pnpm/pnpm/security/advisories/GHSA-4gxm-v5v7-fqc4 https://github.com/pnpm/pnpm/security/advisories/GHSA-4gxm-v5v7-fqc4

Exploits

https://github.com/pnpm/pnpm/security/advisories/GHSA-4gxm-v5v7-fqc4 https://github.com/pnpm/pnpm/security/advisories/GHSA-4gxm-v5v7-fqc4

Frequently Asked Questions

What is CVE-2026-55699? +

pnpm is a package manager. Prior to 10.34.2 and 11.5.3, Manifest bin object keys such as "", ".", and ".." passed pnpm's bin-name guard. When a malicious package was installed globally, later global remove, update, or add-replacement flows could re-derive those names from the installed manifest and pass path.join(globalBinDir, binName) to removeBin. For "." this targets the global bin directory; for ".." this targets its parent. This vulnerability is fixed in 10.34.2 and 11.5.3. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-55699? +

CVE-2026-55699 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0029, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-55699? +

CVE-2026-55699 affects products from pnpm, specifically: pnpm. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-55699? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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