CVE-2026-2069

Summary

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 Software

Weaknesses

• CWE-121: Stack-based Buffer Overflow
• CWE-119: Memory Corruption

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

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/

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