CVE-2026-2069
Low
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.
SeverityLow
CVSS3.3
Exploit probability—
ProductGgml-org Llama.cpp
PublishedFeb 6, 2026
First seenFeb 6, 2026
Weakness typeCWE-121CWE-121CWE-119Memory buffer bounds error
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ggml-org llama.cpp | 55abc39 | — |
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