CVE-2026-25891
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductFiber
PublishedFeb 24, 2026
First seenFeb 24, 2026
Weakness typeCWE-22Path traversal
How to fix
Update
- gofiber fiber3.1.0 or later
- github.com/gofiber/fiber/v33.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| gofiber fiber | 3.0.0 ≤ v < 3.1.0 | 3.1.0 |
| github.com/gofiber/fiber/v3Go | v < 3.1.0 | 3.1.0 |
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