llama.cpp b5854 before b11275 Integer Overflow in gguf_init_from_reader

Advisories

llama.cpp b5854 before b11275 Integer Overflow in gguf_init_from_reader

Severity: medium
Date: 10/26/2026
Affecting: llama.cpp >= b5854, < b11275
llama.cpp >= 0.1.0, < 0.6.0
CVE: CVE-2026-116840
CWE: CWE-190 Integer Overflow or Wraparound
CVSS: 6.9
CVSS V4 Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
References: https://github.com/ggml-org/llama.cpp/issues/26978
https://github.com/ggml-org/llama.cpp/pull/26979
https://github.com/ggml-org/llama.cpp/commit/a6ea155d3d38b3f6f43d0c0dc29c2d592413ef44
https://github.com/ggml-org/llama.cpp/blob/v0.5.0/ggml/src/gguf.cpp#L794-L795
llama.cpp b11275 Release Notes
Credit: Xiang Chen (x14ngch3n), Jeongwoo Lee, x14ngch3n
Description: llama.cpp b5854 before b11275 contains an integer overflow vulnerability in gguf_init_from_reader that bypasses the CVE-2025-53630 size check when padding near-SIZE_MAX tensor sizes. Attackers can supply a crafted GGUF file whose tensor size pads to zero, causing an undersized data blob and out-of-bounds reads by consumers.

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