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TI-2026-20922 Aliases CVE-2026-25882GHSA-mrq8-rjmw-wpq3

Fiber has a Denial of Service Vulnerability via Route Parameter Overflow

Priority MEDIUM 64CWE-129Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

Fiber is an Express inspired web framework written in Go. A denial of service vulnerability exists in Fiber v2 and v3 that allows remote attackers to crash the application by sending requests to routes with more than 30 parameters. The vulnerability results from missing validation during route registration combined with an unbounded array write during request matching. Version 2.52.12 patches the issue in the v2 branch and 3.1.0 patches the issue in the v3 branch.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00666 52nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed fiber (gofiber): 2.52.12, 3.1.0github.com/gofiber/fiber/v2 (Go): 2.52.12+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
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
gofiberfiber2.0.0 to before 2.52.12; 3.0.0 to before 3.1.02.52.12, 3.1.0Patch availableCNA
—github.com/gofiber/fiber/v2 (Go)before 2.52.122.52.12Patch availableGHSA-mrq8-rjmw-wpq3
—github.com/gofiber/fiber/v3 (Go)before 3.1.03.1.0Patch availableGHSA-mrq8-rjmw-wpq3
  • fiber Vendorgofiber Affected 2.0.0 to before 2.52.12; 3.0.0 to before 3.1.0 Fixed in 2.52.12, 3.1.0 Patch available CNA
  • github.com/gofiber/fiber/v2 (Go) Vendor— Affected before 2.52.12 Fixed in 2.52.12 Patch available GHSA-mrq8-rjmw-wpq3
  • github.com/gofiber/fiber/v3 (Go) Vendor— Affected before 3.1.0 Fixed in 3.1.0 Patch available GHSA-mrq8-rjmw-wpq3

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:*2.0.0 to before 2.52.12; 3.0.0 to before 3.1.0Vulnerablegofiber
  • cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:* Versions 2.0.0 to before 2.52.12; 3.0.0 to before 3.1.0 Vulnerable ·gofiber

Remediation

  • Fix · CNA fiber (gofiber) Fixed in 2.52.12, 3.1.0
  • Fix · GHSA-mrq8-rjmw-wpq3 github.com/gofiber/fiber/v2 (Go) Fixed in 2.52.12 Advisory →
  • Fix · GHSA-mrq8-rjmw-wpq3 github.com/gofiber/fiber/v3 (Go) Fixed in 3.1.0 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-2026-25882
  2. 2026-10-03 Alias added: GHSA-mrq8-rjmw-wpq3

References

Exploit 1

Patch 1

Advisory 1

Other 4

  • 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-2026-30834 Fiber: XSS in AutoFormat Content Negotiation CVSS 4.0MEDIUM 5.3
  • TI-2026-38670 Fiber: HSTS header never set in helmet middleware due to incorrect protocol check CVSS 3.1MEDIUM 4.8
See all 16 →

Sources

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