Bug 2498213 (CVE-2026-45045)

Summary: CVE-2026-45045 github.com/gofiber/fiber: GoFiber: IP spoofing allows bypass of security controls via X-Real-IP header manipulation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the GoFiber web framework's `BalancerForward` proxy helper. This vulnerability allows a remote attacker to spoof their IP address by manipulating the `X-Real-IP` header. Because the `Header.Add()` function is used instead of `Header.Set()`, an attacker-supplied `X-Real-IP` value is forwarded to upstream servers alongside the legitimate IP. This can lead to bypassing IP-based security controls such as rate limiting, access control lists (ACLs), and geolocation restrictions, and can also poison audit logs.
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Bug Depends On: 2521825    
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Description OSIDB Bzimport 2026-07-08 20:02:37 UTC 
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.