{"id":"CVE-2026-53624","aliases":["GHSA-gv83-gqw6-9j2c","GO-2026-5912"],"url":"https://o3.security/vulnerability/CVE-2026-53624","summary":"Fiber: HSTS header never set in helmet middleware due to incorrect protocol check","details":"Fiber is an Express inspired web framework written in Go. Prior to 3.4.0, the helmet middleware in middleware/helmet/helmet.go never sets the Strict-Transport-Security response header even when HSTSMaxAge is configured because it checks c.Protocol() for https instead of c.Scheme(). This issue is fixed in version 3.4.0.","published":"2026-07-08T19:32:08.191Z","modified":"2026-08-27T18:26:16.639526956Z","cvss":{"score":4.8,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"},"epss":{"score":0.00212,"percentile":0.11489,"asOf":"2026-09-08"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/gofiber/fiber","fixedVersion":"3.4.0"}],"fix":{"url":"https://github.com/gofiber/fiber/commit/04dd4e7754f61768fddccacc79057e416f13e6bf","label":"gofiber/fiber@04dd4e7"},"references":[{"type":"WEB","url":"https://github.com/gofiber/fiber/releases/tag/v3.4.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53624.json"},{"type":"ADVISORY","url":"https://github.com/gofiber/fiber/security/advisories/GHSA-gv83-gqw6-9j2c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53624"},{"type":"FIX","url":"https://github.com/gofiber/fiber/commit/04dd4e7754f61768fddccacc79057e416f13e6bf"},{"type":"FIX","url":"https://github.com/gofiber/fiber/pull/4389"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T18:26:16.639526956Z"}}