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Fix Lack of Resources & Rate Limiting in Iris

Iris is highly performant, but high-speed Go frameworks are prime targets for resource exhaustion. Without explicit constraints, an attacker can crash your service via OOM (Out of Memory) by sending massive payloads or trigger CPU starvation through rapid-fire requests. Hardening Iris requires strict body size limits and token-bucket rate limiting.

The Vulnerable Pattern

package main

import “github.com/kataras/iris/v12”


func main() {
app := iris.New()


// VULNERABLE: No limit on request body size and no rate limiting.
// An attacker can send a 2GB JSON payload to exhaust RAM.
app.Post("/api/data", func(ctx iris.Context) {
    var val interface{}
    ctx.ReadJSON(&val)
    ctx.JSON(iris.Map{"status": "ok"})
})

app.Listen(":8080")


}

The Secure Implementation

The secure implementation mitigates 'Lack of Resources' using a multi-layered approach. First, `iris.LimitRequestBodySize` ensures the server rejects massive payloads before they are fully buffered into memory, preventing Out-Of-Memory kills. Second, the `ratelimit` middleware implements a token-bucket algorithm to throttle abusive IPs, protecting downstream logic and databases from CPU exhaustion. Finally, setting `ReadTimeout` and `WriteTimeout` prevents attackers from holding connections open indefinitely, a common tactic in Slowloris DoS attacks.

package main

import (
“github.com/kataras/iris/v12”
“github.com/kataras/iris/v12/middleware/ratelimit”
“time”
)


func main() {
app := iris.New()


// 1. Global Resource Limit: Prevent OOM by capping request bodies at 1MB
app.Use(iris.LimitRequestBodySize(1 * 1024 * 1024))

// 2. Rate Limiting: Define a rule (e.g., 5 requests per second)
limitRule := ratelimit.New(ratelimit.Every(1*time.Second), 5)

app.Post("/api/data", limitRule, func(ctx iris.Context) {
    var val interface{}
    if err := ctx.ReadJSON(&val); err != nil {
        ctx.StopWithStatus(iris.StatusRequestEntityTooLarge)
        return
    }
    ctx.JSON(iris.Map{"status": "secure"})
})

// 3. Server-level timeouts to prevent Slowloris attacks
app.Run(iris.Addr(":8080"), iris.WithConfiguration(iris.Configuration{
    ReadTimeout:  10 * time.Second,
    WriteTimeout: 10 * time.Second,
}))


}

System Alert • ID: 4558
Target: Iris API
Potential Vulnerability

Your Iris API might be exposed to Lack of Resources & Rate Limiting

74% of Iris apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.

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