Overview
Unrestricted resource consumption vulnerabilities occur when a service processes inputs that cause an explosion of internal work, such as repeatedly invoking expensive DB queries. CVE-2026-35441 demonstrates how GraphQL aliasing can cause a single request to trigger many expensive relational queries concurrently, overwhelming CPU, memory, and I/O. In practice, an authenticated user could abuse GraphQL aliases to drive a large number of queries without built-in throttling, leading to denial of service or degraded service for other users. The Directus bug was fixed in 11.17.0, illustrating the need for per-request cost controls and safe resolver design when GraphQL is exposed. In Go applications using Gin, a similar pattern can manifest if GraphQL resolvers fire independent queries per alias and there is no deduplication, batching, or cost-limiting, enabling resource exhaustion from a single malicious request.
Affected Versions
Directus: pre-11.17.0 (fixed in 11.17.0); Go Gin-specific versions not applicable; CVE demonstrates broader pattern
Code Fix Example
Go (Gin) API Security Remediation
package main
import (
"log"
"net/http"
"sync"
"time"
"github.com/gin-gonic/gin"
)
type User struct {
ID string `json:"id"`
Name string `json:"name"`
}
// Mock DB
var mockDB = map[string]User{
"alice": {ID: "alice", Name: "Alice"},
"bob": {ID: "bob", Name: "Bob"},
"carol": {ID: "carol", Name: "Carol"},
}
// VULNERABLE: launches a goroutine per alias without bounds
func vulnerableResolve(ids []string) map[string]User {
results := make(map[string]User, len(ids))
var mu sync.Mutex
var wg sync.WaitGroup
for _, id := range ids {
wg.Add(1)
go func(id string) {
defer wg.Done()
// Simulate expensive per-alias DB call
time.Sleep(30 * time.Millisecond)
mu.Lock()
if u, ok := mockDB[id]; ok {
results[id] = u
} else {
results[id] = User{ID: id, Name: ""}
}
mu.Unlock()
}(id)
}
wg.Wait()
return results
}
// FIX: batch fetches, deduplicates, and uses a single (simulated) batch DB call
func fixedResolve(ids []string) map[string]User {
// Deduplicate IDs
uniq := make(map[string]struct{}, len(ids))
for _, id := range ids {
uniq[id] = struct{}{}
}
// Batch fetch (single simulated DB call)
time.Sleep(80 * time.Millisecond)
res := make(map[string]User, len(uniq))
for id := range uniq {
if u, ok := mockDB[id]; ok {
res[id] = u
} else {
res[id] = User{ID: id, Name: ""}
}
}
return res
}
type GraphQLRequest struct {
IDs []string `json:"ids"`
}
func main() {
r := gin.Default()
// Vulnerable endpoint: demonstrates unbounded per-alias concurrency
r.POST("/graphql/vuln", func(c *gin.Context) {
var req GraphQLRequest
if err := c.BindJSON(&req); err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": "invalid request"})
return
}
res := vulnerableResolve(req.IDs)
c.JSON(http.StatusOK, res)
})
// Fixed endpoint: demonstrates batched, deduplicated resolution
r.POST("/graphql/fix", func(c *gin.Context) {
var req GraphQLRequest
if err := c.BindJSON(&req); err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": "invalid request"})
return
}
res := fixedResolve(req.IDs)
c.JSON(http.StatusOK, res)
})
log.Println("Server running on :8080")
if err := r.Run(":8080"); err != nil {
log.Fatal(err)
}
}