Kakao khaiii up to 0.4 JSON Config File Linear.cpp khaiii::nn::Linear::open hidden_dim/class_num out-of-bounds

Summaryinfo

A vulnerability was found in Kakao khaiii up to 0.4. It has been classified as problematic. This affects the function khaiii::nn::Linear::open of the file src/main/cpp/khaiii/nn/Linear.cpp of the component JSON Config File Handler. This manipulation of the argument hidden_dim/class_num causes out-of-bounds. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability appears as CVE-2026-115801. The attack requires local access. In addition, an exploit is available. The vendor explains: "khaiii treats the resource directory (--rsc-dir) as trusted input, like a binary or a shared library. To use this defect, an attacker must already be able to write to that directory. With that access, an attacker can change the analysis results without this defect."

Detailsinfo

A vulnerability has been found in Kakao khaiii up to 0.4 and classified as problematic. Affected by this vulnerability is the function khaiii::nn::Linear::open of the file src/main/cpp/khaiii/nn/Linear.cpp of the component JSON Config File Handler. The manipulation of the argument hidden_dim/class_num with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-115801. The exploitation appears to be easy. Attacking locally is a requirement. Technical details and also a public exploit are known.

It is possible to download the exploit at github.com. It is declared as proof-of-concept. The vendor explains: "khaiii treats the resource directory (--rsc-dir) as trusted input, like a binary or a shared library. To use this defect, an attacker must already be able to write to that directory. With that access, an attacker can change the analysis results without this defect."

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

• Kakao

Name

• khaiii

Version

• 0.1
• 0.2
• 0.3
• 0.4

Support

• end of life

Website

• Product: https://github.com/kakao/khaiii/

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Accepted

• Submit #1022283: Kakao khaiii commit 3d0c8944374163b1107fd6690ccf3a408430a02d (master, 2025-05-22; version 0.4) Out-of-bounds Read (by Dem000000)

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