CVE-2026-116840

llama.cpp b5854 before b11275 Integer Overflow in gguf_init_from_reader

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.

Scores

Weaknesses (CWE)

• CWE-190

European references

• ENISA EUVD · EUVD-2026-110571
• GCVE · GCVE-0-2026-116840

Affected products

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
• https://github.com/ggml-org/llama.cpp/releases/tag/b11275
• https://www.vulncheck.com/advisories/llama-cpp-b5854-before-b11275-integer-overflow-in-gguf-init-from-reader

Sources