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CVE-2026-45045

MEDIUM
5.3
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-45045
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-05-08 18:07 UTC
Published
2026-07-08 19:26 UTC
Last updated
2026-07-09 13:20 UTC
Primary CWE
CWE-290
CWE-290: Authentication Bypass by Spoofing
Vendor / Product
gofiber / fiber
Sources
cve.org  ·  NVD

Severity & Metrics

5.3 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
yes
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
gofiber fiber — >= 3.0.0-beta.2, < 3.3.0, < 2.52.14
Weakness (CWE)
CWESourceDescription
CWE-290 cna CWE-290: Authentication Bypass by Spoofing
CVSS scores (1)
ScoreSeverityVersionSourceVector
5.3 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
References (7)
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