{"id":"CVE-2026-2069","state":"PUBLISHED","title":"ggml-org llama.cpp GBNF Grammar llama-grammar.cpp llama_grammar_advance_stack stack-based overflow","description":"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.","publishedAt":"2026-02-06T22:02:08.933Z","updatedAt":"2026-02-23T09:28:33.822Z","severity":{"score":4.8,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","source":"VulDB"},"assigner":"VulDB","products":["ggml-org llama.cpp"],"affected":[{"vendor":"ggml-org","product":"llama.cpp","versions":[{"version":"55abc39","status":"affected"}],"modules":["GBNF Grammar Handler"]}],"references":["https://vuldb.com/?id.344636","https://vuldb.com/?ctiid.344636","https://vuldb.com/?submit.745263","https://github.com/ggml-org/llama.cpp/issues/18988","https://github.com/ggml-org/llama.cpp/issues/18988#event-4426704865","https://github.com/user-attachments/files/24761101/poc.zip","https://github.com/ggml-org/llama.cpp/pull/18993","https://github.com/ggml-org/llama.cpp/"],"weaknesses":["CWE-121","CWE-119"],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/2xxx/CVE-2026-2069.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-2069","state":"PUBLISHED","datePublished":"2026-02-06T22:02:08.933Z","dateUpdated":"2026-02-23T09:28:33.822Z","assignerShortName":"VulDB","assignerOrgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateReserved":"2026-02-06T07:41:07.150Z"},"containers":{"cna":{"title":"ggml-org llama.cpp GBNF Grammar llama-grammar.cpp llama_grammar_advance_stack stack-based overflow","descriptions":[{"lang":"en","value":"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. 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