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CVE-2026-25891

HIGH CVSS 4.0: 7.7 EPSS 0.02%
Updated Feb 24, 2026
Express
Parameter Value
CVSS 7.7 (HIGH)
Type CWE-22 (Path Traversal)
Vendor Express
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption

CVSS Vector v4.0

Weakness Type (CWE)