{"id":"CVE-2026-44332","state":"PUBLISHED","title":"Fiber: Username Enumeration via Timing Oracle in BasicAuth Default Authorizer","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.","publishedAt":"2026-07-08T19:32:15.113Z","updatedAt":"2026-07-09T14:33:29.004Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["gofiber fiber"],"affected":[{"vendor":"gofiber","product":"fiber","versions":[{"version":"< 3.3.0","status":"affected"}]}],"references":["https://github.com/gofiber/fiber/security/advisories/GHSA-g5vh-55hw-rxm8","https://github.com/gofiber/fiber/pull/4245","https://github.com/gofiber/fiber/commit/c7ac00edd19f9669b1aebbec6e229658baaa059e","https://github.com/gofiber/fiber/releases/tag/v3.3.0"],"weaknesses":["CWE-203"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/44xxx/CVE-2026-44332.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-44332","state":"PUBLISHED","datePublished":"2026-07-08T19:32:15.113Z","dateUpdated":"2026-07-09T14:33:29.004Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-05T19:52:59.146Z"},"containers":{"cna":{"title":"Fiber: Username Enumeration via Timing Oracle in BasicAuth Default Authorizer","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"gofiber","product":"fiber","versions":[{"version":"< 3.3.0","status":"affected"}]}],"references":[{"url":"https://github.com/gofiber/fiber/security/advisories/GHSA-g5vh-55hw-rxm8","name":"https://github.com/gofiber/fiber/security/advisories/GHSA-g5vh-55hw-rxm8","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/gofiber/fiber/pull/4245","name":"https://github.com/gofiber/fiber/pull/4245","tags":["x_refsource_MISC"]},{"url":"https://github.com/gofiber/fiber/commit/c7ac00edd19f9669b1aebbec6e229658baaa059e","name":"https://github.com/gofiber/fiber/commit/c7ac00edd19f9669b1aebbec6e229658baaa059e","tags":["x_refsource_MISC"]},{"url":"https://github.com/gofiber/fiber/releases/tag/v3.3.0","name":"https://github.com/gofiber/fiber/releases/tag/v3.3.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-203","lang":"en","description":"CWE-203: Observable Discrepancy","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-08T19:32:15.113Z"},"source":{"advisory":"GHSA-g5vh-55hw-rxm8","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-09T14:33:24.172923Z","id":"CVE-2026-44332","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-09T14:33:29.004Z"}}]}}}