CVE-2026-25891

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Path Traversal in Fiber Static Middleware Allows Arbitrary File Access

Publication date: 2026-02-24

Last updated on: 2026-02-27

Assigner: GitHub, Inc.

Description

Fiber is an Express inspired web framework written in Go. A Path Traversal (CWE-22) vulnerability in Fiber allows a remote attacker to bypass the static middleware sanitizer and read arbitrary files on the server file system on Windows. This affects Fiber v3 through version 3.0.0. This has been patched in Fiber v3 version 3.1.0.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-02-24

Last Modified

2026-02-27

Generated

2026-07-06

AI Q&A

2026-02-25

EPSS Evaluated

2026-07-05

NVD

CVE-2026-25891

EUVD

EUVD-2026-8565

Affected Vendors & Products

Vendor	Product	Version / Range
gofiber	fiber	From 3.0.0 (inc) to 3.1.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

Compliance Impact

I don't know

Impact Analysis

An attacker exploiting this vulnerability can read arbitrary files on the server's file system remotely without any authentication or user interaction.

This can lead to exposure of sensitive information, configuration files, or other critical data stored on the server, potentially compromising the security and privacy of the system.

Executive Summary

This vulnerability is a Path Traversal (CWE-22) issue in the Fiber web framework, which is inspired by Express and written in Go. It allows a remote attacker to bypass the static middleware sanitizer and read arbitrary files on the server's file system when running on Windows.

The vulnerability affects Fiber versions 3 through 3.0.0 and has been fixed in version 3.1.0.

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, you should upgrade Fiber to version 3.1.0 or later, as the issue has been patched in that release.

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