{"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"}}]}}

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{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.0.0-beta.2,3.3.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.52.14)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "fiber", "source": "cna", "vendor": "gofiber"}, "product": "fiber", "vendor": "gofiber"}], "created": "2026-07-08T20:30:04.432153+00:00", "updated": "2026-07-09T04:30:13.480665+00:00", "vendors": ["gofiber", "gofiber$PRODUCT$fiber"]}