{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-45045",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-05-08T18:07:27.341Z",
        "datePublished": "2026-07-08T19:26:26.580Z",
        "dateUpdated": "2026-07-09T13:20:08.367Z"
    },
    "containers": {
        "cna": {
            "title": "Fiber: X-Real-IP Spoofing via Header.Add() in BalancerForward",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-290",
                            "lang": "en",
                            "description": "CWE-290: Authentication Bypass by Spoofing",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "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"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/gofiber/fiber/security/advisories/GHSA-gcfq-8gqf-4876",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/gofiber/fiber/security/advisories/GHSA-gcfq-8gqf-4876"
                },
                {
                    "name": "https://github.com/gofiber/fiber/pull/4260",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/gofiber/fiber/pull/4260"
                },
                {
                    "name": "https://github.com/gofiber/fiber/pull/4495",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/gofiber/fiber/pull/4495"
                },
                {
                    "name": "https://github.com/gofiber/fiber/commit/1403cc8292da3220e9316960b4030cc722a0f396",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/gofiber/fiber/commit/1403cc8292da3220e9316960b4030cc722a0f396"
                },
                {
                    "name": "https://github.com/gofiber/fiber/commit/33c9501288ab47a429c8b5e701493f0c3c0af37d",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/gofiber/fiber/commit/33c9501288ab47a429c8b5e701493f0c3c0af37d"
                },
                {
                    "name": "https://github.com/gofiber/fiber/releases/tag/v2.52.14",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/gofiber/fiber/releases/tag/v2.52.14"
                },
                {
                    "name": "https://github.com/gofiber/fiber/releases/tag/v3.3.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/gofiber/fiber/releases/tag/v3.3.0"
                }
            ],
            "affected": [
                {
                    "vendor": "gofiber",
                    "product": "fiber",
                    "versions": [
                        {
                            "version": ">= 3.0.0-beta.2, < 3.3.0",
                            "status": "affected"
                        },
                        {
                            "version": "< 2.52.14",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-07-08T19:26:26.580Z"
            },
            "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."
                }
            ],
            "source": {
                "advisory": "GHSA-gcfq-8gqf-4876",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-07-09T13:19:42.395861Z",
                                "id": "CVE-2026-45045",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-07-09T13:20:08.367Z"
                }
            }
        ]
    }
}