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    CVE-2026-45045

    Fiber is an Express inspired web framework written in Go. Prior to 3.3.0 and 2.52.14, the BalancerForward proxy helper in middleware/proxy/proxy.go uses Header.Add() instead of Header.Set() when injecting X-Real-IP, allowing an attacker-supplied first X-Real-IP value to be forwarded to upstream servers for logging, rate limiting, and access control. This issue is fixed in version 3.3.0 and 2.52.14.

    Published:Jul 8, 2026
    Last Modified:Jul 9, 2026
    EPS:Jul 8, 2026
    EPSS Score:0.00455
    CVSS Score:5.3

    Affected Products

    Vendor
    Gofiber
    Product
    Fiber

    Exploits

    https://github.com/gofiber/fiber/security/advisories/GHSA-gcfq-8gqf-4876

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High