Denied-file disclosure via trailing backslash
Published Oct 20, 2025 · Updated Oct 20, 2025
Path traversal in the Vite dev server allows remote attackers to read denied files through backslash-terminated URLs on Windows. isFileLoadingAllowed checks the untrimmed request path against config.fsDenyGlob, but the Windows file read drops the trailing separator and returns the denied file. Exploitation requires an affected dev-server version on Windows and explicit network exposure through --host or server.host; the reported consequence is read-only disclosure of files such as environment or certificate files.
Summary
What happened
Path traversal in the Vite dev server allows remote attackers to read denied files through backslash-terminated URLs on Windows. isFileLoadingAllowed checks the untrimmed request path against config.fsDenyGlob, but the Windows file read drops the trailing separator and returns the denied file. Exploitation requires an affected dev-server version on Windows and explicit network exposure through --host or server.host; the reported consequence is read-only disclosure of files such as environment or certificate files.
The record
- CVE
- CVE-2025-62522
- Published
- Oct 20, 2025
- Updated
- Oct 20, 2025
- Vendor
- Vite
- Product
- Vite
- Classifications
- CWE-22, T1005
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 20, 2025CVE publishedPublication date reported by the CVE source.
- Oct 20, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 2.9.18, < 3.0.0
- Affected versionversion=>= 3.2.9, < 4.0.0
- Affected versionversion=>= 4.5.3, < 5.0.0
- Affected versionversion=>= 5.2.6, < 5.4.21
- Affected versionversion=>= 6.0.0, < 6.4.1
- Affected versionversion=>= 7.0.0, < 7.0.8
- Affected versionversion=>= 7.1.0, < 7.1.11
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Upstream trailing-backslash curl proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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