How severe is CVE-2026-55487?

CVE-2026-55487 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-55487 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-55487?

CVE-2026-55487 affects Pnpm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-55487?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-55487 have an EU (EUVD) identifier?

Yes. CVE-2026-55487 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39481.

When was CVE-2026-55487 published?

CVE-2026-55487 was published on 2026-06-25 and last updated on 2026-06-29.

CVE-2026-55487

CVE-2026-55487 is a high-severity vulnerability in Pnpm with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-346.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39481
Weakness: CWE-346
Affected product: Pnpm
Published: 2026-06-25
Last modified: 2026-06-29

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.

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 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-55487 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-55487?: CVE-2026-55487 affects Pnpm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-55487?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-55487 have an EU (EUVD) identifier?: Yes. CVE-2026-55487 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39481.
When was CVE-2026-55487 published?: CVE-2026-55487 was published on 2026-06-25 and last updated on 2026-06-29.

References

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

Affected products (1)

cpe:2.3:a:pnpm:pnpm:*:*:*:*:*:node.js:*:*

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