CVE-2026-55487 pnpm: manifest identity spoof satisfies allowBuilds and runs attacker lifecycle
Attackers can spoof package identities to bypass build approval checks, executing arbitrary code during installation in pnpm.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-55487?
CVE-2026-55487 is a high-severity vulnerability in pnpm, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
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.
Which versions are affected by CVE-2026-55487?
4 open source packages ship an affected version, including pnpm. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
pnpm npm | All versions | 10.34.2 |
pnpm npm | All versions | 10.34.2 |
pnpm npm | From 11.0.0 | 11.5.3 |
pnpm npm | From 11.0.0 | 11.5.3 |
Products include Pnpm Pnpm.
How do I fix CVE-2026-55487?
Upgrade pnpm to a fixed version for your release line: 10.34.2 or 11.5.3.
Is CVE-2026-55487 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55487 exists.
Other vulnerabilities in pnpm
- CVE-2026-50016 pnpm: Transitive dependency alias path traversal allows project path override via symlink replacement
- CVE-2026-55698 pnpm: Project env lockfile can short-circuit package-manager resolution and execute lockfile-selected pnpm bytes
- CVE-2025-69264 pnpm v10+ Bypass "Dependency lifecycle scripts execution disabled by default"
- CVE-2022-26183 Untrusted Search Path in PNPM
- CVE-2026-59195 pnpm: Path traversal in configDependencies env lockfile allows symlink creation outside node_modules/.pnpm-config
Sources
Also known as GHSA-5wx6-mg75-v57r, MINI-x9m6-fwrh-r6p5, ROOT-APP-NPM-CVE-2026-55487.