{"cve":"CVE-2026-44332","nvd":{"published":"2026-07-08T20:16:49.773","modified":"2026-10-25T17:10:00.197","status":"Analyzed","description":"Fiber is an Express inspired web framework written in Go. Prior to 3.3.0, the default Authorizer function in the BasicAuth middleware in middleware/basicauth/config.go uses short-circuit evaluation that skips password hash comparison for non-existent usernames, enabling reliable remote username enumeration through response timing differences. This issue is fixed in version 3.3.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3},"cwes":["CWE-203"],"references":["https://github.com/gofiber/fiber/commit/c7ac00edd19f9669b1aebbec6e229658baaa059e","https://github.com/gofiber/fiber/pull/4245","https://github.com/gofiber/fiber/releases/tag/v3.3.0","https://github.com/gofiber/fiber/security/advisories/GHSA-g5vh-55hw-rxm8"],"products":["gofiber:fiber"],"source":"nvd","synced_at":"2026-10-25T17:50:06.907763985+00:00"},"epss":{"cve":"CVE-2026-44332","score":0.00517,"percentile":0.43685,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-g5vh-55hw-rxm8","url":"https://osv.dev/vulnerability/GHSA-g5vh-55hw-rxm8","summary":"GoFiber Vulnerable to Username Enumeration via Timing Oracle in BasicAuth Default Authorizer","modified":"2026-07-24T19:11:49.453033906Z","packages":[{"ecosystem":"Go","name":"github.com/gofiber/fiber/v3","purl":"pkg:golang/github.com/gofiber/fiber/v3","ranges":["<3.3.0"],"fixed":["3.3.0"]}]},{"id":"GO-2026-5886","url":"https://osv.dev/vulnerability/GO-2026-5886","summary":"GoFiber Vulnerable to Username Enumeration via Timing Oracle in BasicAuth Default Authorizer in github.com/gofiber/fiber","modified":"2026-07-24T19:00:26.870131488Z","packages":[{"ecosystem":"Go","name":"github.com/gofiber/fiber/v3","purl":"pkg:golang/github.com/gofiber/fiber/v3","ranges":["<3.3.0"],"fixed":["3.3.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}