CVE-2026-55697

Description

pnpm is a package manager. Prior to 10.34.2 and 11.5.3, pnpm can install configDependencies declared in pnpm-workspace.yaml before command dispatch. Before the patch, a repository could declare pacquet or @pnpm/pacquet as a config dependency and pnpm treated that repository-controlled dependency as an install-engine opt-in. During install, pnpm resolved a platform-specific @pacquet/<platform>-<arch>/pacquet binary from node_modules/.pnpm-config/<packageName> and spawned it as the developer or CI user. This vulnerability is fixed in 10.34.2 and 11.5.3.

CVSS v3.1 Score

7.5

HIGH

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

EPSS — Exploit Prediction

0.0013

Probability of exploitation

0.03%

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-78 OS Command Injection

CWE-494 CWE-494

CWE-829 CWE-829

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-gj8w-mvpf-x27x https://github.com/pnpm/pnpm/security/advisories/GHSA-gj8w-mvpf-x27x

Exploits

https://github.com/pnpm/pnpm/security/advisories/GHSA-gj8w-mvpf-x27x https://github.com/pnpm/pnpm/security/advisories/GHSA-gj8w-mvpf-x27x

Frequently Asked Questions

What is CVE-2026-55697? +

pnpm is a package manager. Prior to 10.34.2 and 11.5.3, pnpm can install configDependencies declared in pnpm-workspace.yaml before command dispatch. Before the patch, a repository could declare pacquet or @pnpm/pacquet as a config dependency and pnpm treated that repository-controlled dependency as an install-engine opt-in. During install, pnpm resolved a platform-specific @pacquet/<platform>-<arch>/pacquet binary from node_modules/.pnpm-config/<packageName> and spawned it as the developer or CI user. This vulnerability is fixed in 10.34.2 and 11.5.3. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-55697? +

CVE-2026-55697 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0013, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-55697? +

CVE-2026-55697 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-2026-55697? +

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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