CVE-2026-45045

{
  "id": "CVE-2026-45045",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-08T20:16:50.060",
  "lastModified": "2026-10-25T17:10:00.197",
  "vulnStatus": "Analyzed",
  "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."
    },
    {
      "lang": "es",
      "value": "Fiber es un framework web inspirado en Express escrito en Go. Antes de las versiones 3.3.0 y 2.52.14, el asistente de proxy BalancerForward en middleware/proxy/proxy.go utiliza Header.Add() en lugar de Header.Set() al inyectar X-Real-IP, permitiendo que un primer valor de X-Real-IP proporcionado por el atacante sea reenviado a los servidores ascendentes para registro, limitación de velocidad y control de acceso. Este problema está solucionado en las versiones 3.3.0 y 2.52.14."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "gofiber",
          "product": "fiber",
          "versions": [
            {
              "version": ">= 3.0.0-beta.2, < 3.3.0",
              "status": "affected"
            },
            {
              "version": "< 2.52.14",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-09T13:19:42.395861Z",
          "id": "CVE-2026-45045",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-290"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:*",
              "versionEndExcluding": "2.52.14",
              "matchCriteriaId": "34B804BA-609E-4B3E-80E0-D1D3EC25E3F0"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:*",
              "versionStartIncluding": "3.0.0",
              "versionEndExcluding": "3.3.0",
              "matchCriteriaId": "A091E1AB-E012-47CA-9674-734334483EF0"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/gofiber/fiber/commit/1403cc8292da3220e9316960b4030cc722a0f396",
      "source": "[email protected]",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/gofiber/fiber/commit/33c9501288ab47a429c8b5e701493f0c3c0af37d",
      "source": "[email protected]",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/gofiber/fiber/pull/4260",
      "source": "[email protected]",
      "tags": [
        "Issue Tracking",
        "Patch"
      ]
    },
    {
      "url": "https://github.com/gofiber/fiber/pull/4495",
      "source": "[email protected]",
      "tags": [
        "Issue Tracking",
        "Patch"
      ]
    },
    {
      "url": "https://github.com/gofiber/fiber/releases/tag/v2.52.14",
      "source": "[email protected]",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://github.com/gofiber/fiber/releases/tag/v3.3.0",
      "source": "[email protected]",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://github.com/gofiber/fiber/security/advisories/GHSA-gcfq-8gqf-4876",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    }
  ]
}