CVE-2026-27139
Received Received - Intake
Directory Traversal in Go File.ReadDir Allows Metadata Disclosure

Publication date: 2026-03-06

Last updated on: 2026-04-21

Assigner: Go Project

Description
On Unix platforms, when listing the contents of a directory using File.ReadDir or File.Readdir the returned FileInfo could reference a file outside of the Root in which the File was opened. The impact of this escape is limited to reading metadata provided by lstat from arbitrary locations on the filesystem without permitting reading or writing files outside the root.
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Meta Information
Published
2026-03-06
Last Modified
2026-04-21
Generated
2026-06-16
AI Q&A
2026-03-07
EPSS Evaluated
2026-06-14
NVD
CVE-2026-27139
EUVD
EUVD-2026-10087
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
golang go to 1.25.8 (exc)
golang go 1.26.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
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Executive Summary

On Unix platforms, when listing the contents of a directory using File.ReadDir or File.Readdir, the returned FileInfo could reference a file outside of the root directory in which the File was opened.

This means that the directory listing can escape the intended root directory and include metadata about files located elsewhere on the filesystem.

However, this escape is limited to reading metadata provided by lstat and does not allow reading or writing the actual file contents outside the root.

Impact Analysis

This vulnerability allows an attacker or user to obtain metadata information about files outside the intended root directory when listing directory contents.

While it does not permit reading or writing the actual file contents outside the root, the exposure of metadata could potentially reveal sensitive information such as file existence, permissions, or timestamps.

Compliance Impact

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Detection Guidance

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Mitigation Strategies

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