CVE-2026-53624 PUBLISHED

Fiber: HSTS header never set in helmet middleware due to incorrect protocol check

Assigner: GitHub_M
Reserved: 09.06.2026 Published: 08.07.2026 Updated: 08.07.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS Score: 4.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	Low
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	gofiber
Product	fiber
Versions	Version < 3.4.0 is affected

References

https://github.com/gofiber/fiber/security/advisories/GHSA-gv83-gqw6-9j2c
https://github.com/gofiber/fiber/pull/4389
https://github.com/gofiber/fiber/commit/04dd4e7754f61768fddccacc79057e416f13e6bf
https://github.com/gofiber/fiber/releases/tag/v3.4.0

Problem Types

CWE-319: Cleartext Transmission of Sensitive Information CWE