CVE-2026-55487: pnpm is a package manager

Q: How do I fix CVE-2026-55487?

pnpm: upgrade to 10.34.2, 11.5.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-55487 being exploited?

CVE-2026-55487 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-55487 affect?

CVE-2026-55487 affects pnpm. Severity is high (CVSS 7.5). 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

Q: How urgent is CVE-2026-55487?

Priority 33/100. High severity; Public exploit reference

Routine

HIGH 7.5UPGRADE

CVE-2026-55487 is a high-severity flaw (CVSS 7.5) affecting pnpm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-346, CWE-693, CWE-829
Published	2026-06-25
Last modified	2026-06-29

Publisher (CNA): GitHub, Inc. · Vendor: pnpm

Last updated 2026-06-29 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-25 18:16 UTCPublished CVE record published
2026-06-29 21:16 UTCUpdated Record last modified

pnpm pnpm UPGRADE

Affected: < 10.34.2 · >= 11.0.0 and < 11.5.3

Fixed in: 10.34.2, 11.5.3

Safe to downgrade to: a release before 11.0.0

1. Check installed version

npm ls pnpm

2. UPGRADE to 10.34.2

npm install pnpm@">=10.34.2"

3. If no update is available yet, DOWNGRADE to a release before 11.0.0

npm view pnpm versions npm install pnpm@"<11.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-55487?

pnpm: upgrade to 10.34.2, 11.5.3. Exact commands for each OS are on this page.

Is CVE-2026-55487 being exploited?

CVE-2026-55487 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-55487 affect?

CVE-2026-55487 affects pnpm. Severity is high (CVSS 7.5). 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

How urgent is CVE-2026-55487?

Priority 33/100. High severity; Public exploit reference

Software pages

Git vulnerabilities

Related CVEs

CVE-2026-59195 HIGH 8.2 UPGRADE pnpm is a package manager
CVE-2026-59196 HIGH 7.1 UPGRADE pnpm is a package manager
CVE-2026-59194 HIGH 7.1 UPGRADE pnpm is a package manager
CVE-2026-50017 MEDIUM 6.5 UPGRADE pnpm is a package manager
CVE-2026-55697 HIGH 7.5 UPGRADE pnpm is a package manager

References

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