llama.cpp — Vulnerability (CVE-2026-27940)
Date: 2026-03
Affected: ggml/llama.cpp
Attack vector: other
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-27940
CWE: CWE-122
CWE-190
CVSS: 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)

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.


Mitigations:

Architectural layers (MAESTRO):