CVE-2026-45045

Published: Jul 8, 2026Modified: Jul 15, 2026

5.3

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Exploitability: 3.9 / Impact: 1.4

Source: security-advisories@github.com (Secondary)

Description

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.

Affected (2)

Products: Gofiber: Fiber

1 product

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Gofiber Fiber	Before 2.52.14
Gofiber Fiber	From 3.0.0 to 3.3.0

Related CWEs

Authentication Bypass by Spoofing

This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

References (7)

https://github.com/gofiber/fiber/commit/1403cc8292da3220e9316960b4030cc722a0f396

Source: security-advisories@github.com

Patch

https://github.com/gofiber/fiber/commit/33c9501288ab47a429c8b5e701493f0c3c0af37d

Source: security-advisories@github.com

Patch

https://github.com/gofiber/fiber/pull/4260

Source: security-advisories@github.com

Issue TrackingPatch

https://github.com/gofiber/fiber/pull/4495

Source: security-advisories@github.com

Issue TrackingPatch

https://github.com/gofiber/fiber/releases/tag/v2.52.14

Source: security-advisories@github.com

Release Notes

https://github.com/gofiber/fiber/releases/tag/v3.3.0

Source: security-advisories@github.com

Release Notes

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

Source: security-advisories@github.com

ExploitVendor Advisory

Timeline

No history available yet.