CVE-2026-45045Fiber is an Express inspired web framework written in Go.
Updated under an hour ago ()
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It affects gofiber fiber. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-290
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
gofiber fiber gofiber:fiber | before 2.52.14; from 3.0.0 before 3.3.0 | NVD |
References
- https://github.com/gofiber/fiber/commit/1403cc8292da3220e9316960b4030cc722a0f396patch
- https://github.com/gofiber/fiber/commit/33c9501288ab47a429c8b5e701493f0c3c0af37dpatch
- https://github.com/gofiber/fiber/pull/4260issue-tracking, patch
- https://github.com/gofiber/fiber/pull/4495issue-tracking, patch
- https://github.com/gofiber/fiber/releases/tag/v2.52.14release-notes
- https://github.com/gofiber/fiber/releases/tag/v3.3.0release-notes
- https://github.com/gofiber/fiber/security/advisories/GHSA-gcfq-8gqf-4876exploit, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.