{"id":"EUVD-2026-42351","revision":"99c92a3dd824427aa0c7535b167cf084","records":[{"revision":"99c92a3dd824427aa0c7535b167cf084","observedAt":"2026-11-07T13:22:49.328+00:00","statement":{"source":"euvd","id":"EUVD-2026-42351","aliases":["CVE-2026-45045","GHSA-gcfq-8gqf-4876"],"title":"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-sup…","description":"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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3,"severity":null}],"references":["https://github.com/gofiber/fiber/security/advisories/GHSA-gcfq-8gqf-4876","https://github.com/gofiber/fiber/pull/4260","https://github.com/gofiber/fiber/pull/4495","https://github.com/gofiber/fiber/commit/1403cc8292da3220e9316960b4030cc722a0f396","https://github.com/gofiber/fiber/commit/33c9501288ab47a429c8b5e701493f0c3c0af37d","https://github.com/gofiber/fiber/releases/tag/v2.52.14","https://github.com/gofiber/fiber/releases/tag/v3.3.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-42351","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jul 8, 2026, 7:26:26 PM","dateUpdated":"Jul 9, 2026, 1:20:08 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-42351","identifiers":["EUVD-2026-42351","CVE-2026-45045","GHSA-gcfq-8gqf-4876"]},"retained":false,"historicalAffected":[]}],"coverage":[]}