CVE-2026-25882CWE-129

Fiber has a Denial of Service Vulnerability via Route Parameter Overflow

Medium · published February 24, 2026

CVSS v4.0
5.5
EPSS
1%
Percentile
59.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.5 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
EPSS
0.00903 · 59.4th percentile
Weakness
CWE-129 · Improper Validation of Array Index
Published
2026-02-24T21:05Z
EPSS history
Timeline
  • 24 FEB 21:05Z
    Fiber has a Denial of Service Vulnerability via Route Parameter Overflow
    cvelistv5