CVE-2026-25891

Name: CVE-2026-25891
Creator: NVD / NIST
Published: 2026-02-24T22:16:31.44+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.7/10EPSS 0.62%

Last modified Jun 17, 2026

CVE-2026-25891 is a high-severity vulnerability rated 7.7/10 on the CVSS scale. 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. EPSS estimates a 0.62% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS 4.0

7.7/10

CVSS:4.0/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

EPSS Probability

0.62%

45.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Gofiber	Fiber	>= 3.0.0, < 3.1.0

References

https://github.com/gofiber/fiber/commit/59133702301c2ab7b776dd123b474cbd995f2c86Patch
https://github.com/gofiber/fiber/pull/4064Exploit, Issue Tracking
https://github.com/gofiber/fiber/security/advisories/GHSA-m3c2-496v-cw3vExploit, Vendor Advisory

Timeline

Published: Feb 24, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-25891?

How severe is CVE-2026-25891?

CVE-2026-25891 has a CVSS score of 7.7/10 (HIGH severity). The EPSS model estimates a 0.62% probability of exploitation in the next 30 days.

How do I fix CVE-2026-25891?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-25891?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST