High severity · published Feb 24, 2026
CVE-2026-25891
Fiber has an Arbitrary File Read in Static Middleware on Windows
7.5
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
fiber · gofiber
>= 3.0.0, < 3.1.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-25891
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-25891
Patch
https://github.com/gofiber/fiber/commit/59133702301c2ab7b776dd123b474cbd995f2c86
Exploit
https://github.com/gofiber/fiber/pull/4064
Exploit
https://github.com/gofiber/fiber/security/advisories/GHSA-m3c2-496v-cw3v
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