CVE-2026-43629: Ggml Llama.cpp

High severity, CVSS 8.1. EPSS: 0.7% chance of exploitation in the next 30 days.

llama.cpp builds b4882 through b9058 contain a heap buffer overflow vulnerability in the KV cache state restore path where the state_read_data() function computes write size without overflow checking, allowing attackers with write access to the slot_save_path directory to corrupt heap memory. Attackers can craft malicious state files where cell_count multiplication overflows or exceeds tensor buffer allocation to write attacker-controlled bytes past buffer boundaries, potentially resulting in heap metadata corruption, model weight corruption, or arbitrary code execution via function pointer overwrite.

Affected products

• Ggml Llama.cpp: from b4882, up to and including b9058

Published 2026-08-06. Last modified 2026-09-21.