{"id":"CVE-2026-44332","summary":"Fiber: Username Enumeration via Timing Oracle in BasicAuth Default Authorizer","details":"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.","aliases":["GHSA-g5vh-55hw-rxm8"],"modified":"2026-07-15T01:48:56.845249398Z","published":"2026-07-08T19:32:15.113Z","database_specific":{"cwe_ids":["CWE-203"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44332.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/gofiber/fiber/releases/tag/v3.3.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44332.json"},{"type":"ADVISORY","url":"https://github.com/gofiber/fiber/security/advisories/GHSA-g5vh-55hw-rxm8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44332"},{"type":"FIX","url":"https://github.com/gofiber/fiber/commit/c7ac00edd19f9669b1aebbec6e229658baaa059e"},{"type":"FIX","url":"https://github.com/gofiber/fiber/pull/4245"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/gofiber/fiber","events":[{"introduced":"0"},{"fixed":"c7ac00edd19f9669b1aebbec6e229658baaa059e"},{"fixed":"a39a035dee6df089d94f4f78e34dd34dac895aee"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"3.3.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v3.2.0","v3.1.0","v3.0.0-rc.2","v3.0.0-rc.1","v3.0.0-beta.5","v3.0.0-beta.4","v3.0.0-beta.3","v2.34.0","v2.34.0-rc.1","v2.33.0","v2.32.0","v2.31.0","v2.30.0","v2.29.0","v2.28.0","v2.27.0","v2.26.0","v2.25.0","v2.24.0","v2.23.0","v2.22.0","v2.21.0","v2.20.2","v2.20.1","v2.20.0","v2.19.0","v2.18.0","v2.17.0","v2.16.0","v2.15.0","v2.14.0","v2.13.0","v2.12.0","v2.11.0","v2.10.0","v2.9.0","v2.8.0","v2.7.1","v2.7.0","v2.6.0","v2.4.1","v2.5.0","v2.4.0","v2.3.3","v2.3.2","v2.3.1","v2.3.0","v2.2.5","v2.2.4","v2.2.3","v2.2.2","v2.2.1","v2.2.0","v2.1.4","v2.1.3","v2.1.2","v1.14.6","v2.1.1","v2.1.0","v2.0.6","v2.0.5","v2.0.4","v2.0.3","v2.0.2","v2.0.1","v2.0.0","v1.14.5","v1.14.4","v1.14.3","v1.14.2","v1.14.1","v1.13.3","v1.13.2","v1.13.1","v1.13.0","v1.12.6","v1.12.5","v1.12.4","v1.12.3","v1.12.2","v1.12.1","v1.12.0","v1.11.1","v1.11.0","v1.10.5","v1.10.0","v1.9.6","v1.9.3","v1.9.2","v1.9.1","v1.9.0","v1.8.43","v1.8.42","v1.8.41","v1.8.4","v1.8.3","v1.8.2","v1.8.1","v1.8.0","v1.7.1","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44332.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"}]}