What’s Vulnerable › Vulnerabilities

CVE-2025-71439: llama.cpp before b5649 Heap Out-of-Bounds Read via llama_vocab::impl::print_info

• Severity: medium (CVSS 5.5 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: 2026-10-27 · updated 2026-10-28
• Weakness: CWE-125

Description

llama.cpp before b5649 contains a heap out-of-bounds read vulnerability in llama_vocab::impl::print_info() that allows attackers to crash model loading via oversized special token IDs. Attackers can supply a crafted GGUF model with a short tokenizer.ggml.tokens array, causing llama-cli or llama-server to read past id_to_token and crash.

Affected products

• ggml-org llama.cpp: before b5649 — fixed in b5649

How to fix

Upgrade to a fixed version: ggml-org llama.cpp b5649. Check the vendor advisory for mitigations.

References

• https://github.com/ggml-org/llama.cpp/blob/b5648/src/llama-vocab.cpp#L2771
• https://github.com/ggml-org/llama.cpp/commit/c33fe8b8c4427202706b1434e9fc8ab5752c9cac
• https://github.com/ggml-org/llama.cpp/pull/14145
• https://github.com/ggml-org/llama.cpp/releases/tag/b5649
• https://github.com/ggml-org/llama.cpp/security/advisories/GHSA-g4cc-763q-h9h6
• https://www.vulncheck.com/advisories/llama-cpp-before-b5649-heap-out-of-bounds-read-via-llama-vocab-impl-print-info

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