CVE-2026-43629

Summary

llama.cpp builds b4882 through b9058 contain a heap buffer overflow vulnerability in the KV cache state restore path where the state_read_data() function computes write size without overflow checking, allowing attackers with write access to the slot_save_path directory to corrupt heap memory. Attackers can craft malicious state files where cell_count multiplication overflows or exceeds tensor buffer allocation to write attacker-controlled bytes past buffer boundaries, potentially resulting in heap metadata corruption, model weight corruption, or arbitrary code execution via function pointer overwrite.

Affected Software

Weaknesses

• CWE-787: CWE-787 Out-of-bounds Write
• CWE-190: CWE-190 Integer Overflow or Wraparound

References

• https://github.com/Vladimir-tokarev-cyera/llama-cpp-security-patches

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