Path Traversal in Gofiber Fiber
CVE-2026-25891
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.007 (50.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.001
Affected products
- Gofiber Fiber — versions >= 3.0.0, < 3.1.0
Weakness classification (CWE)
References
- github.com/gofiber/fiber/security/advisories/GHSA-m3c2-496v-cw3v (Exploit, Vendor Advisory)
- github.com/gofiber/fiber/pull/4064 (Exploit, Issue Tracking)
- github.com/gofiber/fiber/commit/59133702301c2ab7b776dd123b474cbd995f2c86 (Patch)
Frequently asked questions
- What is CVE-2026-25891?
- CVE-2026-25891 is a high-severity vulnerability in Gofiber Fiber, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-02-24.
- How severe is CVE-2026-25891?
- High severity. CVSS v3 base score is 7.5 out of 10.