FKIE_CVE-2026-45045

Vulnerability from fkie_nvd - Published: 2026-07-08 20:16 - Updated: 2026-07-09 14:16
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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.
References
security-advisories@github.comhttps://github.com/gofiber/fiber/commit/1403cc8292da3220e9316960b4030cc722a0f396
security-advisories@github.comhttps://github.com/gofiber/fiber/commit/33c9501288ab47a429c8b5e701493f0c3c0af37d
security-advisories@github.comhttps://github.com/gofiber/fiber/pull/4260
security-advisories@github.comhttps://github.com/gofiber/fiber/pull/4495
security-advisories@github.comhttps://github.com/gofiber/fiber/releases/tag/v2.52.14
security-advisories@github.comhttps://github.com/gofiber/fiber/releases/tag/v3.3.0
security-advisories@github.comhttps://github.com/gofiber/fiber/security/advisories/GHSA-gcfq-8gqf-4876
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "fiber",
          "vendor": "gofiber",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.0.0-beta.2, \u003c 3.3.0"
            },
            {
              "status": "affected",
              "version": "\u003c 2.52.14"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-45045",
  "lastModified": "2026-07-09T14:16:31.940",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-45045",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-09T13:19:42.395861Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-08T20:16:50.060",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/gofiber/fiber/commit/1403cc8292da3220e9316960b4030cc722a0f396"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/gofiber/fiber/commit/33c9501288ab47a429c8b5e701493f0c3c0af37d"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/gofiber/fiber/pull/4260"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/gofiber/fiber/pull/4495"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/gofiber/fiber/releases/tag/v2.52.14"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/gofiber/fiber/releases/tag/v3.3.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/gofiber/fiber/security/advisories/GHSA-gcfq-8gqf-4876"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-290"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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