{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-2069", "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "state": "PUBLISHED", "assignerShortName": "VulDB", "dateReserved": "2026-02-06T07:41:07.150Z", "datePublished": "2026-02-06T22:02:08.933Z", "dateUpdated": "2026-02-06T22:02:08.933Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "shortName": "VulDB", "dateUpdated": "2026-02-06T22:02:08.933Z"}, "title": "ggml-org llama.cpp GBNF Grammar llama-grammar.cpp llama_grammar_advance_stack stack-based overflow", "problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-121", "lang": "en", "description": "Stack-based Buffer Overflow"}]}, {"descriptions": [{"type": "CWE", "cweId": "CWE-119", "lang": "en", "description": "Memory Corruption"}]}], "affected": [{"vendor": "ggml-org", "product": "llama.cpp", "versions": [{"version": "55abc39", "status": "affected"}], "modules": ["GBNF Grammar Handler"]}], "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. To fix this issue, it is recommended to deploy a patch."}], "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 4.8, "vectorString": "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", "baseSeverity": "MEDIUM"}}, {"cvssV3_1": {"version": "3.1", "baseScore": 3.3, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C", "baseSeverity": "LOW"}}, {"cvssV3_0": {"version": "3.0", "baseScore": 3.3, "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C", "baseSeverity": "LOW"}}, {"cvssV2_0": {"version": "2.0", "baseScore": 1.7, "vectorString": "AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C"}}], "timeline": [{"time": "2026-02-06T00:00:00.000Z", "lang": "en", "value": "Advisory disclosed"}, {"time": "2026-02-06T01:00:00.000Z", "lang": "en", "value": "VulDB entry created"}, {"time": "2026-02-06T08:46:12.000Z", "lang": "en", "value": "VulDB entry last update"}], "credits": [{"lang": "en", "value": "TYGLS (VulDB User)", "type": "reporter"}], "references": [{"url": "https://vuldb.com/?id.344636", "name": "VDB-344636 | ggml-org llama.cpp GBNF Grammar llama-grammar.cpp llama_grammar_advance_stack stack-based overflow", "tags": ["vdb-entry", "technical-description"]}, {"url": "https://vuldb.com/?ctiid.344636", "name": "VDB-344636 | CTI Indicators (IOB, IOC, IOA)", "tags": ["signature", "permissions-required"]}, {"url": "https://vuldb.com/?submit.745263", "name": "Submit #745263 | llama.cpp commit 55abc39 Stack-based Buffer Overflow", "tags": ["third-party-advisory"]}, {"url": "https://github.com/ggml-org/llama.cpp/issues/18988", "tags": ["issue-tracking"]}, {"url": "https://github.com/ggml-org/llama.cpp/issues/18988#event-4426704865", "tags": ["issue-tracking"]}, {"url": "https://github.com/user-attachments/files/24761101/poc.zip", "tags": ["exploit"]}, {"url": "https://github.com/ggml-org/llama.cpp/pull/18993", "tags": ["issue-tracking", "patch"]}, {"url": "https://github.com/ggml-org/llama.cpp/", "tags": ["product"]}]}}}

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