How severe is CVE-2026-23889?

CVE-2026-23889 has a CVSS 3.x base score of 6.5, rated medium 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 none.

Is CVE-2026-23889 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23889?

CVE-2026-23889 affects Pnpm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23889?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-23889 have an EU (EUVD) identifier?

Yes. CVE-2026-23889 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4657.

When was CVE-2026-23889 published?

CVE-2026-23889 was published on 2026-01-26 and last updated on 2026-06-17.

CVE-2026-23889

CVE-2026-23889 is a medium-severity vulnerability in Pnpm with a CVSS 3.x base score of 6.5. 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-22.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-4657
Weakness: CWE-22
Affected product: Pnpm
Published: 2026-01-26
Last modified: 2026-06-17

Description

pnpm is a package manager. Prior to version 10.28.1, a path traversal vulnerability in pnpm's tarball extraction allows malicious packages to write files outside the package directory on Windows. The path normalization only checks for `./` but not `.\`. On Windows, backslashes are directory separators, enabling path traversal. This vulnerability is Windows-only. This issue impacts Windows pnpm users and Windows CI/CD pipelines (GitHub Actions Windows runners, Azure DevOps). It can lead to overwriting `.npmrc`, build configs, or other files. Version 10.28.1 contains a patch.

Frequently asked questions

What is CVE-2026-23889?: pnpm is a package manager. Prior to version 10.28.1, a path traversal vulnerability in pnpm's tarball extraction allows malicious packages to write files outside the package directory on Windows. The path normalization only checks for `./` but not `.\`. On Windows, backslashes are directory separators, enabling path traversal. This vulnerability is Windows-only. This issue impacts Windows pnpm users and Windows CI/CD pipelines (GitHub Actions Windows runners, Azure DevOps). It can lead to overwriting `.npmrc`, build configs, or other files. Version 10.28.1 contains a patch.
How severe is CVE-2026-23889?: CVE-2026-23889 has a CVSS 3.x base score of 6.5, rated medium 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 none.
Is CVE-2026-23889 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23889?: CVE-2026-23889 affects Pnpm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23889?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-23889 have an EU (EUVD) identifier?: Yes. CVE-2026-23889 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4657.
When was CVE-2026-23889 published?: CVE-2026-23889 was published on 2026-01-26 and last updated on 2026-06-17.

References

Affected products (1)

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

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