{"id":"CVE-2026-2069","details":"A flaw has been found in ggml-org llama.cpp up to 55abc39. Impacted is the function llama_grammar_advance_stack of the file llama.cpp/src/llama-grammar.cpp of the component GBNF Grammar Handler. This manipulation causes stack-based buffer overflow. The attack needs to be launched locally. The exploit has been published and may be used. Patch name: 18993. To fix this issue, it is recommended to deploy a patch.","modified":"2026-03-15T14:53:47.933848Z","published":"2026-02-06T22:16:12.883Z","references":[{"type":"WEB","url":"https://github.com/user-attachments/files/24761101/poc.zip"},{"type":"WEB","url":"https://vuldb.com/?ctiid.344636"},{"type":"WEB","url":"https://vuldb.com/?id.344636"},{"type":"WEB","url":"https://vuldb.com/?submit.745263"},{"type":"WEB","url":"https://github.com/ggml-org/llama.cpp/"},{"type":"REPORT","url":"https://github.com/ggml-org/llama.cpp/issues/18988"},{"type":"REPORT","url":"https://github.com/ggml-org/llama.cpp/issues/18988#event-4426704865"},{"type":"FIX","url":"https://github.com/ggml-org/llama.cpp/pull/18993"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-2069.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"}]}