How severe is CVE-2026-55700?

CVE-2026-55700 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability low.

Is CVE-2026-55700 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-55700?

CVE-2026-55700 affects Pnpm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-55700?

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-2026-55700 have an EU (EUVD) identifier?

Yes. CVE-2026-55700 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39487.

When was CVE-2026-55700 published?

CVE-2026-55700 was published on 2026-06-25 and last updated on 2026-06-29.

CVE-2026-55700

CVE-2026-55700 is a high-severity vulnerability in Pnpm with a CVSS 3.x base score of 7.1. 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-22.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39487
Weakness: CWE-22
Affected product: Pnpm
Published: 2026-06-25
Last modified: 2026-06-29

Description

pnpm is a package manager. From 11.3.0 until 11.5.3, `pnpm stage download` derived a local filename from registry-controlled package name and version fields. A crafted manifest could escape the selected download directory and overwrite another reachable file. The merged fix validates both fields, derives one safe filename, and verifies the final destination before writing. This vulnerability is fixed in 11.5.3.

Frequently asked questions

What is CVE-2026-55700?: pnpm is a package manager. From 11.3.0 until 11.5.3, `pnpm stage download` derived a local filename from registry-controlled package name and version fields. A crafted manifest could escape the selected download directory and overwrite another reachable file. The merged fix validates both fields, derives one safe filename, and verifies the final destination before writing. This vulnerability is fixed in 11.5.3.
How severe is CVE-2026-55700?: CVE-2026-55700 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability low.
Is CVE-2026-55700 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-55700?: CVE-2026-55700 affects Pnpm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-55700?: 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-2026-55700 have an EU (EUVD) identifier?: Yes. CVE-2026-55700 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39487.
When was CVE-2026-55700 published?: CVE-2026-55700 was published on 2026-06-25 and last updated on 2026-06-29.

References

Affected products (1)

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

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