ggml-org llama.cpp up to 0.5.x GGUF File gguf_init_from_reader integer overflow

Summaryinfo

A vulnerability was found in ggml-org llama.cpp up to 0.5.x and classified as problematic. Affected by this issue is the function gguf_init_from_reader of the component GGUF File Handler. The manipulation results in integer overflow. This vulnerability is reported as CVE-2026-116829. The attack requires a local approach. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in ggml-org llama.cpp up to 0.5.x. Affected is the function gguf_init_from_reader of the component GGUF File Handler. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

llama.cpp b10398 before b11301 contains an integer overflow vulnerability in gguf_init_from_reader that allows attackers to bypass tensor element-count validation by supplying shapes whose product wraps to zero. Attackers can craft GGUF files with enormous tensor extents that overflow ggml_nbytes() and strides, causing out-of-bounds memory access when buffers are sized from wrapped byte counts.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-116829 since 10/26/2026. The exploitability is told to be easy. The attack needs to be approached locally. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 0.6.0 eliminates this vulnerability. Applying the patch b11301 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• ggml-org

Name

• llama.cpp

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5

Website

• Product: https://github.com/ggml-org/llama.cpp/

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