CVE-2026-43631: Ggml Llama.cpp

High severity, CVSS 8.1. EPSS: 0.6% chance of exploitation in the next 30 days.

llama.cpp builds b7492 through the latest b9060 contains a use-after-free vulnerability in the vocab pointer of llama-server when the --sleep-idle-seconds feature is enabled, allowing unauthenticated remote attackers to execute arbitrary code. Attackers can trigger the vulnerability by sending requests to affected endpoints while the server transitions to sleep mode, causing concurrent worker threads to dereference a freed vocab pointer that can be reclaimed with attacker-controlled data to achieve remote code execution.

Affected products

• Ggml Llama.cpp: from b7492, up to and including b9060

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