CVE-2026-55700

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.

CVSS v3.1 Score

7.1

HIGH

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

EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.18%

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	11.3.0 — 11.5.3

References

Advisories & Patches

https://github.com/pnpm/pnpm/pull/12303 https://github.com/pnpm/pnpm/security/advisories/GHSA-v23m-ccfg-pq9h

Exploits

https://github.com/pnpm/pnpm/security/advisories/GHSA-v23m-ccfg-pq9h

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-55700? +

CVE-2026-55700 has a CVSS v3.1 score of 7.1 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-2026-55700? +

CVE-2026-55700 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-2026-55700? +

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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