CVE-2026-25899
High · 7.5CVSS
7.5
EPSS
0.7%
Published
Feb 24, 2026
CISA due date
—
The record
Fiber is an Express inspired web framework written in Go. In versions on the v3 branch prior to 3.1.0, the use of the `fiber_flash` cookie can force an unbounded allocation on any server. A crafted 10-character cookie value triggers an attempt to allocate up to 85GB of memory via unvalidated msgpack deserialization. No authentication is required. Every GoFiber v3 endpoint is affected regardless of whether the application uses flash messages. Version 3.1.0 fixes the issue.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Go | github.com/gofiber/fiber/v3 | 0 | 3.1.0 |
| openSUSE:Leap 15.6 | govulncheck-vulndb | 0 | 0.0.20260226T182644-150000.1.149.1 |
Related vulnerabilities
- GO-2026-4534 Fiber is Vulnerable to Denial of Service via Flash Cookie Unbounded Allocation in… Same vulnerability
- GO-2026-4540 Fiber has an Arbitrary File Read in Static Middleware on Windows in… Also affects github.com/gofiber/fiber/v3
- GO-2026-4543 Fiber has a Denial of Service Vulnerability via Route Parameter Overflow in… Also affects github.com/gofiber/fiber/v3
- CVE-2026-25891 Fiber is an Express inspired web framework written in Go. Also affects github.com/gofiber/fiber/v3
- CVE-2026-25882 Fiber is an Express inspired web framework written in Go. Also affects github.com/gofiber/fiber/v3
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