gofiber Fiber up to 2.52.13/3.2.x Proxy Helper proxy.go Header.Add/Header.Set X-Real-IP access control

Summaryinfo

A vulnerability described as problematic has been identified in gofiber Fiber up to 2.52.13/3.2.x. This vulnerability affects the function Header.Add/Header.Set of the file middleware/proxy/proxy.go of the component Proxy Helper. The manipulation of the argument X-Real-IP results in access control. This vulnerability is reported as CVE-2026-45045. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in gofiber Fiber up to 2.52.13/3.2.x. It has been classified as problematic. Affected is the function Header.Add/Header.Set of the file middleware/proxy/proxy.go of the component Proxy Helper. The manipulation of the argument X-Real-IP with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-45045 since 05/08/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 2.52.14 or 3.3.0 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• gofiber

Name

• Fiber

Version

• 2.52.0
• 2.52.1
• 2.52.2
• 2.52.3
• 2.52.4
• 2.52.5
• 2.52.6
• 2.52.7
• 2.52.8
• 2.52.9
• 2.52.10
• 2.52.11
• 2.52.12
• 2.52.13
• 3.0
• 3.1
• 3.2

Website

• Product: https://github.com/gofiber/fiber/

CPE 2.3info

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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