Overview
CVE-2026-33651 describes a real-world SQL injection flaw in WWBN AVideo where tainted input is passed through multiple functions and ultimately concatenated into a SQL LIKE clause, enabling time-based blind SQL injection to exfiltrate data. Although the PHP-specific path was mitigated by a patch (commit 75d45780728294ededa1e3f842f95295d3e7d144), the underlying issue-unvalidated taint reaching an SQL accumulator-illustrates a class of injection flaws that can affect any language stack, including Go. This guide explains how such an issue manifests in Go (Gin) projects and how to remediate it to prevent attackers from exploiting similar patterns in Go services. The reference CVE-IDs and CWE-89 are included to align remediation with real-world advisories.
Code Fix Example
Go (Gin) API Security Remediation
package main
import (
"database/sql"
"log"
"net/http"
"github.com/gin-gonic/gin"
_ "github.com/go-sql-driver/mysql"
)
var db *sql.DB
func main() {
// Initialize DB (replace DSN with real credentials)
var err error
db, err = sql.Open("mysql", "user:password@tcp(127.0.0.1:3306)/dbname")
if err != nil {
log.Fatal(err)
}
defer db.Close()
r := gin.Default()
r.GET("/vuln", vulnerableSearch)
r.GET("/fix", fixedSearch)
if err := r.Run(":8080"); err != nil {
log.Fatal(err)
}
}
func vulnerableSearch(c *gin.Context) {
q := c.Query("q")
// Vulnerable: direct string concatenation leads to SQL injection
query := "SELECT id, name FROM users WHERE name LIKE '%" + q + "%'"
rows, err := db.Query(query)
if err != nil {
c.String(http.StatusInternalServerError, "error: %v", err)
return
}
defer rows.Close()
count := 0
for rows.Next() {
count++
}
c.JSON(200, gin.H{"count": count})
}
func fixedSearch(c *gin.Context) {
q := c.Query("q")
// Secure: parameterized query with bound parameter for LIKE
query := "SELECT id, name FROM users WHERE name LIKE ?"
rows, err := db.Query(query, "%"+q+"%")
if err != nil {
c.String(http.StatusInternalServerError, "error: %v", err)
return
}
defer rows.Close()
count := 0
for rows.Next() {
count++
}
c.JSON(200, gin.H{"count": count})
}