CVE-2026-53624 Fiber: HSTS header never set in helmet middleware due to incorrect protocol check

What is CVE-2026-53624?

CVE-2026-53624 is a medium-severity vulnerability in gofiber fiber, published on 8 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-319

Which versions are affected by CVE-2026-53624?

3 open source packages ship an affected version, including github.com/gofiber/fiber and github.com/gofiber/fiber/v3. It affects 1 product.

Products include Gofiber Fiber.

How do I fix CVE-2026-53624?

Upgrade github.com/gofiber/fiber to 3.4.0 or later.

Is CVE-2026-53624 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-53624 exists.

Other vulnerabilities in gofiber fiber

• CVE-2024-38513 Fiber Session Middleware Token Injection Vulnerability Critical 10.0
• CVE-2023-45128 CSRF Token Reuse Vulnerability in fiber Critical 10.0
• CVE-2024-25124 Fiber has Insecure CORS Configuration, Allowing Wildcard Origin with Credentials Critical 9.4
• CVE-2025-66630 Fiber insecurely fallsback in utils.UUIDv4() / utils.UUID() — predictable / zero‑UUID on crypto/rand failure Critical 9.2
• CVE-2025-54801 Fiber Susceptible to Crash via `BodyParser` Due to Unvalidated Large Slice Index in Decoder High 8.7

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-gv83-gqw6-9j2c, GO-2026-5912, MINI-6rv7-gfj9-hp3g, MINI-f7p5-wxxr-c3fg, UBUNTU-CVE-2026-53624.