High severityNVD Advisory· Published Feb 24, 2026· Updated Feb 24, 2026
Fiber has an Arbitrary File Read in Static Middleware on Windows
CVE-2026-25891
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/gofiber/fiber/v3Go | < 3.1.0 | 3.1.0 |
Affected products
3- ghsa-coords2 versionspkg:golang/github.com/gofiber/fiber/v3pkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2015.6
< 3.1.0+ 1 more
- (no CPE)range: < 3.1.0
- (no CPE)range: < 0.0.20260226T182644-150000.1.149.1
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-m3c2-496v-cw3vghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-25891ghsaADVISORY
- github.com/gofiber/fiber/commit/59133702301c2ab7b776dd123b474cbd995f2c86ghsax_refsource_MISCWEB
- github.com/gofiber/fiber/pull/4064ghsax_refsource_MISCWEB
- github.com/gofiber/fiber/security/advisories/GHSA-m3c2-496v-cw3vghsax_refsource_CONFIRMWEB
- pkg.go.dev/vuln/GO-2026-4540ghsaWEB
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