CVE-2026-42554

A flaw was found in Fiber, a web framework for Go. A remote attacker can exploit a Cross-Site Scripting XSS vulnerability by manipulating the Accept header to text/html when a request handler uses the AutoFormat feature with attacker-controlled data. This allows the attacker to inject arbitrary...

CVE-2026-42554 Fiber: XSS in AutoFormat Content Negotiation

Fiber is a web framework for Go. Prior to 2.52.12 and 3.1.0, Cross-Site Scripting vulnerability in Go Fiber allows a remote attacker to inject arbitrary HTML/JavaScript by supplying Accept: text/html on any request whose handler passes attacker-influenced data to the AutoFormat feature. The...

CVE-2026-25899

Fiber is an Express inspired web framework written in Go. In versions on the v3 branch prior to 3.1.0, the use of the fiberflash cookie can force an unbounded allocation on any server. A crafted 10-character cookie value triggers an attempt to allocate up to 85GB of memory via unvalidated msgpack...

SUSE CVE-2025-48075

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 keyidxvalue syntax, but when idx is negative, it causes a panic instead of returning an error stating it cannot process t...