Vulnerability in Gofiber Fiber
CVE-2026-53624
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 · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (10.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 10.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Gofiber Fiber — versions < 3.4.0
Weakness classification (CWE)
References
- github.com/gofiber/fiber/security/advisories/GHSA-gv83-gqw6-9j2c (Exploit, Vendor Advisory)
- github.com/gofiber/fiber/pull/4389 (Patch, Issue Tracking)
- github.com/gofiber/fiber/commit/04dd4e7754f61768fddccacc79057e416f13e6bf (Patch)
- github.com/gofiber/fiber/releases/tag/v3.4.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-53624?
- CVE-2026-53624 is a medium-severity vulnerability in Gofiber Fiber, classified under Cleartext Transmission of Sensitive Information. CVSS score: 4.8/10. Published 2026-07-08.
- How severe is CVE-2026-53624?
- Medium severity. CVSS v3 base score is 4.8 out of 10.