CVE-2026-45045

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-45045
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45045.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-45045
Aliases
Downstream
Related
Published
2026-07-08T19:26:26.580Z
Modified
2026-08-12T18:48:11.151554087Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
Summary
Fiber: X-Real-IP Spoofing via Header.Add() in BalancerForward
Details

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.

Database specific 
{
    "cwe_ids": [
        "CWE-290"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45045.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/gofiber/fiber

Affected ranges

Type
GIT
Repo
https://github.com/gofiber/fiber
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
a74500f6335abc020023d3581a46ba56a893edc3
Introduced
f8f34f642fb3682c341ede7816e7cf861aa7df89
Fixed
a39a035dee6df089d94f4f78e34dd34dac895aee
Fixed
1403cc8292da3220e9316960b4030cc722a0f396
Fixed
33c9501288ab47a429c8b5e701493f0c3c0af37d
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.52.14"
        },
        {
            "introduced": "3.0.0"
        },
        {
            "fixed": "3.3.0"
        }
    ],
    "cpe": "cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:*",
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

v1.*
v1.0.0
v1.10.0
v1.10.5
v1.11.0
v1.11.1
v1.12.0
v1.12.1
v1.12.2
v1.12.3
v1.12.4
v1.12.5
v1.12.6
v1.13.0
v1.13.1
v1.13.2
v1.13.3
v1.14.1
v1.14.2
v1.14.3
v1.14.4
v1.14.5
v1.14.6
v1.7.1
v1.8.0
v1.8.1
v1.8.2
v1.8.3
v1.8.4
v1.8.41
v1.8.42
v1.8.43
v1.9.0
v1.9.1
v1.9.2
v1.9.3
v1.9.6
v2.*
v2.0.0
v2.0.1
v2.0.2
v2.0.3
v2.0.4
v2.0.5
v2.0.6
v2.1.0
v2.1.1
v2.1.2
v2.1.3
v2.1.4
v2.10.0
v2.11.0
v2.12.0
v2.13.0
v2.14.0
v2.15.0
v2.16.0
v2.17.0
v2.18.0
v2.19.0
v2.2.0
v2.2.1
v2.2.2
v2.2.3
v2.2.4
v2.2.5
v2.20.0
v2.20.1
v2.20.2
v2.21.0
v2.22.0
v2.23.0
v2.24.0
v2.25.0
v2.26.0
v2.27.0
v2.28.0
v2.29.0
v2.3.0
v2.3.1
v2.3.2
v2.3.3
v2.30.0
v2.31.0
v2.32.0
v2.33.0
v2.34.0
v2.34.0-rc.1
v2.34.1
v2.35.0
v2.36.0
v2.37.0
v2.37.0-rc.1
v2.37.1
v2.38.0
v2.38.1
v2.39.0
v2.4.0
v2.4.1
v2.40.0
v2.40.1
v2.41.0
v2.42.0
v2.43.0
v2.44.0
v2.45.0
v2.46.0
v2.47.0
v2.48.0
v2.49.0
v2.49.1
v2.49.2
v2.5.0
v2.50.0
v2.51.0
v2.52.0
v2.52.1
v2.52.10
v2.52.11
v2.52.12
v2.52.13
v2.52.2
v2.52.3
v2.52.4
v2.52.5
v2.52.6
v2.52.7
v2.52.8
v2.52.9
v2.6.0
v2.7.0
v2.7.1
v2.8.0
v2.9.0
v3.*
v3.0.0-beta.3
v3.0.0-beta.4
v3.0.0-beta.5
v3.0.0-rc.1
v3.0.0-rc.2
v3.1.0
v3.2.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45045.json"