What’s Vulnerable › Vulnerabilities

CVE-2026-116840: llama.cpp b5854 before b11275 Integer Overflow in gguf_init_from_reader

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-27 · updated 2026-10-27
• Weakness: CWE-190

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.

Affected products

• ggml-org llama.cpp: from b5854 before b11275; from 0.1.0 before 0.6.0 — fixed in b11275, 0.6.0

How to fix

Upgrade to a fixed version: ggml-org llama.cpp b11275, 0.6.0. Check the vendor advisory for mitigations.

References

• https://github.com/ggml-org/llama.cpp/blob/v0.5.0/ggml/src/gguf.cpp#L794-L795
• https://github.com/ggml-org/llama.cpp/commit/a6ea155d3d38b3f6f43d0c0dc29c2d592413ef44
• 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/releases/tag/b11275
• https://www.vulncheck.com/advisories/llama-cpp-b5854-before-b11275-integer-overflow-in-gguf-init-from-reader

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