What is the CVSS score of CVE-2026-23889?

CVE-2026-23889 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N. EPSS exploitation probability: 0.0%.

Which versions of Windows are affected by CVE-2026-23889?

Organizations using pnpm should be aware of notable risk from CVE-2026-23889, a path traversal vulnerability rated CVSS 6.5. This could allow unauthorized file access.. A patch is available.

Is there a public PoC exploit available for CVE-2026-23889?

Yes, a public proof-of-concept exploit is available for CVE-2026-23889. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-23889?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Review file handling controls.

Windows CVE-2026-23889

MEDIUM

Path Traversal (CWE-22)

2026-01-26 security-advisories@github.com

GHSA-6x96-7vc8-cm3p

Windows Node.js Azure Github Path Traversal Pnpm Red Hat

6.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.5 MEDIUM

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Red Hat

6.5 MEDIUM

qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:00 vuln.today

PoC Detected

Jan 28, 2026 - 17:33 vuln.today

Public exploit code

Patch released

Jan 28, 2026 - 17:33 nvd

Patch available

CVE Published

Jan 26, 2026 - 22:15 nvd

MEDIUM 6.5

DescriptionGitHub Advisory

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.

AnalysisAI

Path traversal in pnpm's tarball extraction on Windows allows attackers to write files outside the intended package directory by exploiting incomplete path normalization that fails to block backslash-based traversal sequences. Public exploit code exists for this vulnerability, which affects Windows developers and CI/CD pipelines (GitHub Actions, Azure DevOps) and could result in overwriting sensitive configuration files like .npmrc or build configurations. A patch is available in pnpm version 10.28.1 and later.

Technical ContextAI

Classified as CWE-22 (Path Traversal). Affects Pnpm. 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 overwr

RemediationAI

A vendor patch is available — apply it immediately. Validate and sanitize file path inputs. Use allowlists. Restrict network access to the affected service where possible.