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.
- Affected products
- Fiber
- Gofiber Fiber
- < 2.52.14, 3.3.0
- Fix
- Available
- CVSS 3.1
- 5.3 MEDIUM
- EPSS
- 0.4% (29th percentile)
- Weakness
- CWE-290
- NVD status
- Analyzed
- Published
- 2026-07-08
CVE-2026-45045 at NVD
No indexed exploits for CVE-2026-45045 yet
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No exploit for CVE-2026-45045 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.