Fiber is an Express-inspired web framework written in Go. Starting in version 2.52.6 and prior to version 2.52.7, `fiber.Ctx.BodyParser` can map flat data to nested slices using `key[idx]value` syntax, but when idx is negative, it causes a panic instead of returning an error stating it cannot process the data. Since this data is user-provided, this could lead to denial of service for anyone relying on this `fiber.Ctx.BodyParser` functionality. Version 2.52.7 fixes the issue.
The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array.
| Link | Tags |
|---|---|
| https://github.com/gofiber/fiber/security/advisories/GHSA-hg3g-gphw-5hhm | exploit vendor advisory |
| https://github.com/gofiber/fiber/commit/e115c08b8f059a4a031b492aa9eef0712411853d | patch |