{"id":"CVE-2026-45045","revision":"e5ea00eafc7748bf91add7f85a9ad819","records":[{"revision":"e5ea00eafc7748bf91add7f85a9ad819","observedAt":"2026-10-25T10:17:33.838+00:00","statement":{"source":"nvd","id":"CVE-2026-45045","aliases":[],"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":"2026-07-08T20:16:50.06+00:00","modifiedAt":"2026-07-15T20:50:55.16+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/gofiber/fiber/commit/1403cc8292da3220e9316960b4030cc722a0f396","https://github.com/gofiber/fiber/commit/33c9501288ab47a429c8b5e701493f0c3c0af37d","https://github.com/gofiber/fiber/pull/4260","https://github.com/gofiber/fiber/pull/4495","https://github.com/gofiber/fiber/releases/tag/v2.52.14","https://github.com/gofiber/fiber/releases/tag/v3.3.0","https://github.com/gofiber/fiber/security/advisories/GHSA-gcfq-8gqf-4876"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-45045","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-290"],"productCriteria":["cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:*"],"sourceDates":{"published":"2026-07-08T20:16:50.060","lastModified":"2026-07-15T20:50:55.160"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-45045","identifiers":["CVE-2026-45045"]},"retained":false,"historicalAffected":[]}],"coverage":[]}