What’s Vulnerable › Vulnerabilities

CVE-2026-2069: ggml-org llama.cpp GBNF Grammar llama-grammar.cpp llama_grammar_advance_stack stack-based overflow

• Severity: low (CVSS 3.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-06 · updated 2026-06-17
• Weakness: CWE-119

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.

Affected products

• ggml-org llama.cpp: 55abc39

References

• https://github.com/ggml-org/llama.cpp/
• https://github.com/ggml-org/llama.cpp/issues/18988
• https://github.com/ggml-org/llama.cpp/issues/18988#event-4426704865
• https://github.com/ggml-org/llama.cpp/pull/18993
• https://github.com/user-attachments/files/24761101/poc.zip
• https://vuldb.com/?ctiid.344636
• https://vuldb.com/?id.344636
• https://vuldb.com/?submit.745263

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