CVE-2026-50015

Description

pnpm is a package manager. Prior to 10.34.0 and 11.4.0, pnpm's patch application pipeline (@pnpm/patch-package) performs no path validation on file paths extracted from .patch files. An attacker who contributes a malicious patch file via a pull request can write attacker-controlled content to or delete arbitrary files on the filesystem during pnpm install, as the user running the install. The diff --git header paths containing ../../ sequences traverse out of the package directory, and the traversal is difficult to catch in code review because patch file diff headers are opaque to most reviewers. This vulnerability is fixed in 10.34.0 and 11.4.0.

CVSS v3.1 Score

7.3

HIGH

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

EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.19%

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

Affected Products

Vendor	Product	Versions
pnpm	pnpm	< 10.34.0
pnpm	pnpm	11.0.0 — 11.4.0

References

Advisories & Patches

https://github.com/pnpm/pnpm/security/advisories/GHSA-rxhj-4m44-96r4 https://github.com/pnpm/pnpm/security/advisories/GHSA-rxhj-4m44-96r4

Exploits

https://github.com/pnpm/pnpm/security/advisories/GHSA-rxhj-4m44-96r4 https://github.com/pnpm/pnpm/security/advisories/GHSA-rxhj-4m44-96r4

Frequently Asked Questions

What is CVE-2026-50015? +

pnpm is a package manager. Prior to 10.34.0 and 11.4.0, pnpm's patch application pipeline (@pnpm/patch-package) performs no path validation on file paths extracted from .patch files. An attacker who contributes a malicious patch file via a pull request can write attacker-controlled content to or delete arbitrary files on the filesystem during pnpm install, as the user running the install. The diff --git header paths containing ../../ sequences traverse out of the package directory, and the traversal is difficult to catch in code review because patch file diff headers are opaque to most reviewers. This vulnerability is fixed in 10.34.0 and 11.4.0. It has a CVSS v3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-50015? +

CVE-2026-50015 has a CVSS v3.1 score of 7.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0027, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-50015? +

CVE-2026-50015 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-2026-50015? +

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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