File disclosure via reserved device name normalization
Published Jul 18, 2025 · Updated Nov 4, 2025
Path traversal in Node.js on Windows allows remote attackers to read files through crafted reserved device names passed to path.join. The win32 path normalizer treated only drive-letter prefixes as device roots, so names such as CON, PRN, and AUX allowed dot segments to survive joining. Exploitation requires an application to pass attacker-controlled path segments to path.join and then use the result for file access; the published impact is file disclosure only.
Summary
What happened
Path traversal in Node.js on Windows allows remote attackers to read files through crafted reserved device names passed to path.join. The win32 path normalizer treated only drive-letter prefixes as device roots, so names such as CON, PRN, and AUX allowed dot segments to survive joining. Exploitation requires an application to pass attacker-controlled path segments to path.join and then use the result for file access; the published impact is file disclosure only.
The record
- CVE
- CVE-2025-27210
- Published
- Jul 18, 2025
- Updated
- Nov 4, 2025
- Vendor
- Node.js
- Product
- Node.js
- Classifications
- CWE-22
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 18, 2025CVE publishedPublication date reported by the CVE source.
- Nov 4, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=10.0 <10.*
- Affected versionversion=11.0 <11.*
- Affected versionversion=12.0 <12.*
- Affected versionversion=13.0 <13.*
- Affected versionversion=14.0 <14.*
- Affected versionversion=15.0 <15.*
- Affected versionversion=16.0 <16.*
- Affected versionversion=17.0 <17.*
- Affected versionversion=18.0 <18.*
- Affected versionversion=19.0 <19.*
- Affected versionversion=20.0.0 <20.19.4
- Affected versionversion=22.0.0 <22.17.1
- Affected versionversion=24.0.0 <24.4.1
- Affected versionversion=4.0 <4.*
- Affected versionversion=5.0 <5.*
- Affected versionversion=6.0 <6.*
- Affected versionversion=7.0 <7.*
- Affected versionversion=8.0 <8.*
- Affected versionversion=9.0 <9.*
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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