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TI-2026-38670 Aliases CVE-2026-53624GHSA-gv83-gqw6-9j2c

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

Priority MEDIUM 55CWE-319Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-319.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00212 11th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed fiber (gofiber): 3.4.0github.com/gofiber/fiber (Go): 3.4.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
gofiberfiberbefore 3.4.03.4.0Patch availableCNA
—github.com/gofiber/fiber (Go)before 3.4.03.4.0Patch availableGHSA-gv83-gqw6-9j2c
  • fiber Vendorgofiber Affected before 3.4.0 Fixed in 3.4.0 Patch available CNA
  • github.com/gofiber/fiber (Go) Vendor— Affected before 3.4.0 Fixed in 3.4.0 Patch available GHSA-gv83-gqw6-9j2c

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:*before 3.4.0Vulnerablegofiber
  • cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:* Versions before 3.4.0 Vulnerable ·gofiber

Remediation

  • Fix · CNA fiber (gofiber) Fixed in 3.4.0
  • Fix · GHSA-gv83-gqw6-9j2c github.com/gofiber/fiber (Go) Fixed in 3.4.0 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-53624
  2. 2026-10-03 Alias added: GHSA-gv83-gqw6-9j2c

References

Exploit 1

Patch 2

Other 2

  • TI-2025-34555 Fiber Susceptible to Crash via `BodyParser` Due to Unvalidated Large Slice Index in Decoder CVSS 4.0HIGH 8.7
  • TI-2024-16578 Fiber has Insecure CORS Configuration, Allowing Wildcard Origin with Credentials CVSS 3.1CRITICAL 9.8
  • TI-2025-30446 Fiber panics when fiber.Ctx.BodyParser parses invalid range index CVSS 4.0HIGH 7.7
  • TI-2026-23477 github.com/gofiber/fiber/v3 cache middleware can mix responses across query parameters CVSS 3.1MEDIUM 6.5
  • TI-2026-20922 Fiber has a Denial of Service Vulnerability via Route Parameter Overflow CVSS 4.0MEDIUM 5.5
  • TI-2026-30834 Fiber: XSS in AutoFormat Content Negotiation CVSS 4.0MEDIUM 5.3
See all 16 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences