CVE-2026-25891
Fiber has an Arbitrary File Read in Static Middleware on Windows
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.
INFO
Published Date :
Feb. 24, 2026, 10:16 p.m.
Last Modified :
Feb. 27, 2026, 3:18 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Fiber to version 3.1.0.
- Verify static middleware sanitizer is enabled.
- Avoid processing user-supplied file paths.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-25891.
| URL | Resource |
|---|---|
| https://github.com/gofiber/fiber/commit/59133702301c2ab7b776dd123b474cbd995f2c86 | Patch |
| https://github.com/gofiber/fiber/pull/4064 | Exploit Issue Tracking |
| https://github.com/gofiber/fiber/security/advisories/GHSA-m3c2-496v-cw3v | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-25891 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-25891
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-25891 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-25891 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added CPE Configuration OR *cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:* versions from (including) 3.0.0 up to (excluding) 3.1.0 Added Reference Type GitHub, Inc.: https://github.com/gofiber/fiber/commit/59133702301c2ab7b776dd123b474cbd995f2c86 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/gofiber/fiber/pull/4064 Types: Exploit, Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/gofiber/fiber/security/advisories/GHSA-m3c2-496v-cw3v Types: Exploit, Vendor Advisory -
New CVE Received by [email protected]
Feb. 24, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-22 Added Reference https://github.com/gofiber/fiber/commit/59133702301c2ab7b776dd123b474cbd995f2c86 Added Reference https://github.com/gofiber/fiber/pull/4064 Added Reference https://github.com/gofiber/fiber/security/advisories/GHSA-m3c2-496v-cw3v