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TI-2026-20930 Aliases CVE-2026-25891GHSA-m3c2-496v-cw3v

Fiber has an Arbitrary File Read in Static Middleware on Windows

Priority MEDIUM 41CWE-22Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22 and the CVSS impact.

Summary

Fiber is an Express inspired web framework written in Go. A Path Traversal (CWE-22) vulnerability in Fiber allows a remote attacker to bypass the static middleware sanitizer and read arbitrary files on the server file system on Windows. This affects Fiber v3 through version 3.0.0. This has been patched in Fiber v3 version 3.1.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00703 53rd percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Fixed fiber (gofiber): 3.1.0github.com/gofiber/fiber/v3 (Go): 3.1.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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
gofiberfiber3.0.0 to before 3.1.03.1.0Patch availableCNA
—github.com/gofiber/fiber/v3 (Go)before 3.1.03.1.0Patch availableGHSA-m3c2-496v-cw3v
  • fiber Vendorgofiber Affected 3.0.0 to before 3.1.0 Fixed in 3.1.0 Patch available CNA
  • github.com/gofiber/fiber/v3 (Go) Vendor— Affected before 3.1.0 Fixed in 3.1.0 Patch available GHSA-m3c2-496v-cw3v

CPE configurations NVD · 1

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

Remediation

  • Fix · CNA fiber (gofiber) Fixed in 3.1.0
  • Fix · GHSA-m3c2-496v-cw3v github.com/gofiber/fiber/v3 (Go) Fixed in 3.1.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-25891
  2. 2026-10-03 Alias added: GHSA-m3c2-496v-cw3v

References

Exploit 2

Patch 1

Advisory 1

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