CVE-2026-25882
Fiber has a Denial of Service Vulnerability via Route Parameter Overflow
Description
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.
INFO
Published Date :
Feb. 24, 2026, 9:16 p.m.
Last Modified :
Feb. 27, 2026, 3:18 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Fiber to version 2.52.12 or later.
- Update Fiber to version 3.0.1 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-25882.
| URL | Resource |
|---|---|
| https://github.com/gofiber/fiber/blob/main/path.go#L514 | Product |
| https://github.com/gofiber/fiber/blob/v2/path.go#L516 | Product |
| https://github.com/gofiber/fiber/pull/3962 | Issue Tracking Patch |
| https://github.com/gofiber/fiber/security/advisories/GHSA-mrq8-rjmw-wpq3 | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-25882 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-25882
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-25882 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-25882 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:* versions from (including) 3.0.0 up to (excluding) 3.1.0 *cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:* versions from (including) 2.0.0 up to (excluding) 2.52.12 Added Reference Type GitHub, Inc.: https://github.com/gofiber/fiber/blob/main/path.go#L514 Types: Product Added Reference Type GitHub, Inc.: https://github.com/gofiber/fiber/blob/v2/path.go#L516 Types: Product Added Reference Type GitHub, Inc.: https://github.com/gofiber/fiber/pull/3962 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/gofiber/fiber/security/advisories/GHSA-mrq8-rjmw-wpq3 Types: Exploit, Vendor Advisory -
CVE Modified by [email protected]
Feb. 24, 2026
Action Type Old Value New Value Changed Description 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 3.0.1 patches the issue in the v3 branch. 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. -
New CVE Received by [email protected]
Feb. 24, 2026
Action Type Old Value New Value Added Description 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 3.0.1 patches the issue in the v3 branch. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-129 Added Reference https://github.com/gofiber/fiber/blob/main/path.go#L514 Added Reference https://github.com/gofiber/fiber/blob/v2/path.go#L516 Added Reference https://github.com/gofiber/fiber/pull/3962 Added Reference https://github.com/gofiber/fiber/security/advisories/GHSA-mrq8-rjmw-wpq3