llama.cpp builds b7492 through the latest b9060 contains a use-after-free vulnerability in llama-server affecting six tokenization endpoints (/tokenize, /detokenize, /infill, /apply-template, /rerank, and /anthropic/count_tokens) that bypass the task queue and access ctx_server.vocab directly on HTTP worker threads. Attackers can exploit a time-of-check-time-of-use race condition where the main thread destroys and frees vocab after the synchronization lock is released but before the handler finishes using it, causing a crash or potential code execution when --sleep-idle-seconds is configured.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/Vladimir-tokarev-cyera/llama-cpp-security-patches Patch, Third Party Advisory
- https://www.vulncheck.com/advisories/llama-cpp-b7492-b9060-use-after-free-in-tokenization-endpoints Patch, Third Party Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 9.2 · ggmlNVD modified 2026-10-23 21:10
Affected (CPE criteria) 1
cpe:2.3:a:ggml:llama.cpp:*:*:*:*:*:*:*:*
References 2
- https://github.com/Vladimir-tokarev-cyera/llama-cpp-security-patches Patch, Third Party Advisory
- https://www.vulncheck.com/advisories/llama-cpp-b7492-b9060-use-after-free-in-tokenization-endpoints Patch, Third Party Advisory