ggml-org llama.cpp GBNF Grammar llama-grammar.cpp llama_grammar_advance_stack stack-based overflow_CVE-2026-2069

4.8 / 10

MEDIUM

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

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.

Basic Information

ID CVE-2026-2069

Source VulDB

Published Feb 6, 2026 at 22:02

Affected Product

Vendor ggml-org

Product llama.cpp

Version 55abc39

Affected Versions ggml-org llama.cpp 55abc39

CWE Classification

CWE-121 CWE-119

References

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    "published": "2026-02-06T22:02:08.933Z",
    "modified": "2026-02-06T22:02:08.933Z",
    "type": "cve",
    "title": "ggml-org llama.cpp GBNF Grammar llama-grammar.cpp llama_grammar_advance_stack stack-based overflow",
    "source": "VulDB",
    "references": "https://vuldb.com/?id.344636\nhttps://vuldb.com/?ctiid.344636\nhttps://vuldb.com/?submit.745263\nhttps://github.com/ggml-org/llama.cpp/issues/18988\nhttps://github.com/ggml-org/llama.cpp/issues/18988#event-4426704865\nhttps://github.com/user-attachments/files/24761101/poc.zip\nhttps://github.com/ggml-org/llama.cpp/pull/18993\nhttps://github.com/ggml-org/llama.cpp/",
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