| शीर्षक | llama.cpp commit 55abc39 Stack-based Buffer Overflow |
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| विवरण | A stack-based buffer overflow (stack overflow) vulnerability existed in the GBNF grammar handling logic of llama.cpp. When processing specific grammar constructs, the function `llama_grammar_advance_stack()` could enter unbounded recursive expansion because it lacked adequate recursion/cycle protection beyond checking for an empty stack. In particular, a crafted GBNF file containing nested repetition patterns (for example `(...*)*`) could cause the function to repeatedly create new stack states and recursively call itself until the program’s call stack was exhausted. This results in a crash detected by AddressSanitizer and can be exploited as a denial-of-service condition when an application loads attacker-controlled grammar files. The vendor has since addressed the issue. |
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| स्रोत | ⚠️ https://github.com/ggml-org/llama.cpp/issues/18988 |
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| उपयोगकर्ता | TYGLS (UID 94774) |
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| सबमिशन | 23/01/2026 04:29 AM (8 महीनों पहले) |
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| संयम | 06/02/2026 08:41 AM (14 days later) |
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| स्थिति | स्वीकृत |
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| VulDB प्रविष्टि | 344636 [ggml-org llama.cpp तक 55abc39 GBNF Grammar llama-grammar.cpp llama_grammar_advance_stack बफ़र ओवरफ़्लो] |
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| अंक | 20 |
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