CVE-2026-27940

Summary

llama.cpp is an inference of several LLM models in C/C++. Prior to b8146, the gguf_init_from_file_impl() in gguf.cpp is vulnerable to an Integer overflow, leading to an undersized heap allocation. Using the subsequent fread() writes 528+ bytes of attacker-controlled data past the buffer boundary. This is a bypass of a similar bug in the same file - CVE-2025-53630, but the fix overlooked some areas. This vulnerability is fixed in b8146.

Affected Software

Weaknesses

• CWE-122: CWE-122: Heap-based Buffer Overflow
• CWE-190: CWE-190: Integer Overflow or Wraparound

ADP Enrichment

CISA ADP Vulnrichment

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

References

• https://github.com/ggml-org/llama.cpp/security/advisories/GHSA-3p4r-fq3f-q74v

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