CVE-2026-55487: pnpm is a package manager. Prior to 10.34.2 and 11.5.3, the generic peer-suffix normalizer also stripped parenthesized text from git, URL, tarball, fi...

Description

pnpm is a package manager. Prior to 10.34.2 and 11.5.3, the generic peer-suffix normalizer also stripped parenthesized text from git, URL, tarball, file, and other opaque locators. Approval for one source string could therefore authorize a different attacker-controlled source whose locator normalized to the same value. This vulnerability is fixed in 10.34.2 and 11.5.3.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.11%

1.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Pnpm	Pnpm	< 10.34.2
Pnpm	Pnpm	>= 11.0.0, < 11.5.3

References

https://github.com/pnpm/pnpm/security/advisories/GHSA-5wx6-mg75-v57rExploit, Vendor Advisory
https://github.com/pnpm/pnpm/security/advisories/GHSA-5wx6-mg75-v57rExploit, Vendor Advisory

Timeline

Published: Jun 25, 2026
Last Modified: Jun 29, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-55487?

pnpm is a package manager. Prior to 10.34.2 and 11.5.3, the generic peer-suffix normalizer also stripped parenthesized text from git, URL, tarball, file, and other opaque locators. Approval for one source string could therefore authorize a different attacker-controlled source whose locator normalized to the same value. This vulnerability is fixed in 10.34.2 and 11.5.3.

How severe is CVE-2026-55487?

CVE-2026-55487 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.11% probability of exploitation in the next 30 days.

How do I fix CVE-2026-55487?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

Related CVEs from 2026

View all 2026CVEs →