Buffer overflow in Kakao Khaiii
CVE-2026-115801
A security flaw has been discovered in Kakao khaiii up to 0.4. The impacted element 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 results in out-of-bounds read. The attack requires a local approach. The exploit has been released to the public and may be used for attacks. 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." This vulnerability only affects products that are no longer supported by the maintainer.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Kakao Khaiii — versions 0.1, 0.2, 0.3
Weakness classification (CWE)
References
- vuldb.com/vuln/425983 (technical-description, vdb-entry)
- vuldb.com/vuln/425983/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-115801 (third-party-advisory)
- vuldb.com/submit/1022283 (third-party-advisory)
- github.com/kakao/khaiii/issues/129 (issue-tracking)
- github.com/user-attachments/files/33260270/poc.zip (exploit)
- github.com/kakao/khaiii/ (product)
Frequently asked questions
- What is CVE-2026-115801?
- CVE-2026-115801 is a medium-severity vulnerability in Kakao Khaiii, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2026-10-23.
- How severe is CVE-2026-115801?
- Medium severity. CVSS v3 base score is 5.3 out of 10.