ztxz16 fastllm up to 1.8.2 Safetensors Weight Loading src/model.cpp CreateBuffer data_offsets buffer overflow

Summaryinfo

A vulnerability classified as critical was found in ztxz16 fastllm up to 1.8.2. This affects the function SafeTensorItem::CreateBuffer of the file src/model.cpp of the component Safetensors Weight Loading. Such manipulation of the argument data_offsets leads to buffer overflow. This vulnerability is uniquely identified as CVE-2026-112107. The attack can be launched remotely. Moreover, an exploit is present. The project was informed of the problem early through an issue report but has not responded yet.

Detailsinfo

A vulnerability was found in ztxz16 fastllm up to 1.8.2. It has been rated as critical. Affected by this issue is the function SafeTensorItem::CreateBuffer of the file src/model.cpp of the component Safetensors Weight Loading. The manipulation of the argument data_offsets with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-112107. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details as well as a public exploit are known.

The exploit is available at github.com. It is declared as proof-of-concept. The project was informed of the problem early through an issue report but has not responded yet.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• ztxz16

Name

• fastllm

Version

• 1.8.0
• 1.8.1
• 1.8.2

Website

• Product: https://github.com/ztxz16/fastllm/

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Accepted

• Submit #1013187: ztxz16 fastllm commit 324b4d1 (master branch as of 2026-10-04) Heap-based Buffer Overflow (by Dem0000000)

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