# CVE-2025-54801

## Summary

- **CVE ID:** CVE-2025-54801
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-789
- **Published:** Aug 5, 2025
- **Last Modified:** Mar 12, 2026

## Description

Fiber is an Express inspired web framework written in Go. In versions 2.52.8 and below, when using Fiber's Ctx.BodyParser to parse form data containing a large numeric key that represents a slice index (e.g., test.18446744073704), the application crashes due to an out-of-bounds slice allocation in the underlying schema decoder. The root cause is that the decoder attempts to allocate a slice of length idx + 1 without validating whether the index is within a safe or reasonable range. If the idx is excessively large, this leads to an integer overflow or memory exhaustion, causing a panic or crash. This is fixed in version 2.52.9.

## Affected Products

- gofiber — fiber (< 2.52.9)

## References

- [CNA](https://github.com/gofiber/fiber/security/advisories/GHSA-qx2q-88mx-vhg7)
- [CNA](https://github.com/gofiber/fiber/commit/e115c08b8f059a4a031b492aa9eef0712411853d)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.36%
- **EPSS Percentile:** 28.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._