CVE-2026-23890Public exploitNetwork attack vector

Arbitrary file writes via scoped bin traversal

Published Jan 26, 2026 · Updated Jan 26, 2026

Path traversal in pnpm before 10.28.1 allows remote attackers to write files outside node_modules/.bin through a malicious npm package. The package-bins filter accepts bin names beginning with @, then scope normalization preserves ../ segments that link-bins passes to path.join. Exploitation requires a user or CI job to install the package and permits overwriting files within that process's filesystem permissions.

CVSS severity6.5
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in pnpm before 10.28.1 allows remote attackers to write files outside node_modules/.bin through a malicious npm package. The package-bins filter accepts bin names beginning with @, then scope normalization preserves ../ segments that link-bins passes to path.join. Exploitation requires a user or CI job to install the package and permits overwriting files within that process's filesystem permissions.

The record

CVE
CVE-2026-23890
Published
Jan 26, 2026
Updated
Jan 26, 2026
Vendor
pnpm
Product
pnpm
Classifications
CWE-23, T1195.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 10.28.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

pnpm · pnpmversion=< 10.28.1

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-23Relative Path Traversal
T1195.001Compromise Software Dependencies and Development Tools

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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