Vulnerability in Gofiber Fiber
CVE-2026-25882
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.008 · change: +0.002
Affected products
- Gofiber Fiber — versions >= 2.0.0, < 2.52.12, >= 3.0.0, < 3.1.0
Weakness classification (CWE)
References
- github.com/gofiber/fiber/security/advisories/GHSA-mrq8-rjmw-wpq3 (Exploit, Vendor Advisory)
- github.com/gofiber/fiber/pull/3962 (Patch, Issue Tracking)
- github.com/gofiber/fiber/blob/main/path.go (Product)
- github.com/gofiber/fiber/blob/v2/path.go (Product)
Frequently asked questions
- What is CVE-2026-25882?
- CVE-2026-25882 is a high-severity vulnerability in Gofiber Fiber, classified under Improper Validation of Array Index. CVSS score: 7.5/10. Published 2026-02-24.
- How severe is CVE-2026-25882?
- High severity. CVSS v3 base score is 7.5 out of 10.