CVE-2025-54801
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.
How to fix
- gofiber fiber2.52.9 or later
- github.com/gofiber/fiber/v22.52.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| gofiber fiber | v < 2.52.9 | 2.52.9 |
| github.com/gofiber/fiber/v2Go | v < 2.52.9 | 2.52.9 |
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