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TI-2026-32896 Aliases CVE-2026-45045GHSA-gcfq-8gqf-4876

Fiber: X-Real-IP Spoofing via Header.Add() in BalancerForward

Priority LOW 30CWE-290Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-290.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00463 40th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed fiber (gofiber): 3.3.0, 2.52.14github.com/gofiber/fiber/v3 (Go): 3.3.0+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
gofiberfiber3.0.0-beta.2 to before 3.3.0; before 2.52.143.3.0, 2.52.14Patch availableCNA
—github.com/gofiber/fiber/v3 (Go)before 3.3.03.3.0Patch availableGHSA-gcfq-8gqf-4876
—github.com/gofiber/fiber/v2 (Go)before 2.52.142.52.14Patch availableGHSA-gcfq-8gqf-4876
  • fiber Vendorgofiber Affected 3.0.0-beta.2 to before 3.3.0; before 2.52.14 Fixed in 3.3.0, 2.52.14 Patch available CNA
  • github.com/gofiber/fiber/v3 (Go) Vendor— Affected before 3.3.0 Fixed in 3.3.0 Patch available GHSA-gcfq-8gqf-4876
  • github.com/gofiber/fiber/v2 (Go) Vendor— Affected before 2.52.14 Fixed in 2.52.14 Patch available GHSA-gcfq-8gqf-4876

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:*before 2.52.14; 3.0.0 to before 3.3.0Vulnerablegofiber
  • cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:* Versions before 2.52.14; 3.0.0 to before 3.3.0 Vulnerable ·gofiber

Remediation

  • Fix · CNA fiber (gofiber) Fixed in 3.3.0, 2.52.14
  • Fix · GHSA-gcfq-8gqf-4876 github.com/gofiber/fiber/v3 (Go) Fixed in 3.3.0 Advisory →
  • Fix · GHSA-gcfq-8gqf-4876 github.com/gofiber/fiber/v2 (Go) Fixed in 2.52.14 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-45045
  2. 2026-10-03 Alias added: GHSA-gcfq-8gqf-4876

References

Exploit 1

Patch 4

Advisory 1

Other 3

  • TI-2025-34555 Fiber Susceptible to Crash via `BodyParser` Due to Unvalidated Large Slice Index in Decoder CVSS 4.0HIGH 8.7
  • TI-2024-16578 Fiber has Insecure CORS Configuration, Allowing Wildcard Origin with Credentials CVSS 3.1CRITICAL 9.8
  • TI-2025-30446 Fiber panics when fiber.Ctx.BodyParser parses invalid range index CVSS 4.0HIGH 7.7
  • TI-2026-23477 github.com/gofiber/fiber/v3 cache middleware can mix responses across query parameters CVSS 3.1MEDIUM 6.5
  • TI-2026-20922 Fiber has a Denial of Service Vulnerability via Route Parameter Overflow CVSS 4.0MEDIUM 5.5
  • TI-2026-30834 Fiber: XSS in AutoFormat Content Negotiation CVSS 4.0MEDIUM 5.3
See all 16 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences