Vulnerability · Published Jun 25, 2026 · Assigned by GitHub_M

CVE-2026-55487pnpm: manifest identity spoof satisfies allowBuilds and runs attacker lifecycle

High 7.5

In plain English

A high-severity security flaw in pnpm from pnpm. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.2%top 92.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	pnpm	10.34.2	GHSA-5wx6-mg75-v57r
npm	pnpm	11.5.3	GHSA-5wx6-mg75-v57r

Affected products (as reported)

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

Weakness: CWE-346, CWE-693, CWE-829 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References

https://github.com/pnpm/pnpm/security/advisories/GHSA-5wx6-mg75-v57r x_refsource_CONFIRM