ztxz16 fastllm up to 0.1.8.2 String Parsing gguf.cpp GGUFBuffer::ReadString len buffer overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in ztxz16 fastllm up to 0.1.8.2. Affected is the function GGUFBuffer::ReadString of the file third_party/gguf/gguf.cpp of the component String Parsing. Such manipulation of the argument len leads to buffer overflow. This vulnerability is uniquely identified as CVE-2026-112108. 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, which was classified as critical, has been found in ztxz16 fastllm up to 0.1.8.2. Affected by this issue is the function GGUFBuffer::ReadString of the file third_party/gguf/gguf.cpp of the component String Parsing. The manipulation of the argument len 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 available at github.com. This vulnerability is handled as CVE-2026-112108. 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

• 0.1.8.0
• 0.1.8.1
• 0.1.8.2

Website

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

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CPE 2.2info

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Accepted

• Submit #1013191: ztxz16 fastllm up to v0.1.8.2 and git master 05284b4e (analyzed at commit 324b4d1) Heap-based Buffer Overflow (by Dem0000000)

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