CVE-2026-70638: Ggml Llama.cpp

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

llama.cpp builds b1886 through b7445 contain an integer overflow vulnerability in the LLaMA-Android JNI wrapper where the new_1batch() function multiplies sizeof(llama_seq_id) by an attacker-controlled n_seq_max parameter without overflow validation, causing heap buffer allocation to wrap and allocate insufficient memory. Attackers can exploit this by providing a crafted n_seq_max value through a malicious model file or JNI call to trigger heap corruption and achieve denial of service or arbitrary code execution on Android applications using the LLaMA-Android binding.

Affected products

• Ggml Llama.cpp: from b1886, up to and including b7445

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