CVE-2026-43632

Name of the Vulnerable Software and Affected Versions llama.cpp versions b7492 through b9060

Description A use-after-free issue exists in llama-server. This occurs when six tokenization endpoints—'/tokenize', '/detokenize', '/infill', '/apply-template', '/rerank', and '/anthropic/count tokens'—bypass the task queue to access ctx server.vocab directly on HTTP worker threads. A time-of-check-time-of-use race condition allows the main thread to destroy and free vocab after the synchronization lock is released but before the handler finishes using it. This can lead to a crash or potential code execution when --sleep-idle-seconds is configured.

Recommendations Update llama.cpp to a version later than b9060. As a temporary mitigation, avoid configuring the --sleep-idle-seconds parameter.