CVE-2025-15536

MEDIUM

OpenCC < 1.1.9 - Heap-Based Buffer Overflow in MaxMatchSegmentation

Title source: llm

Description

A weakness has been identified in BYVoid OpenCC up to 1.1.9. This vulnerability affects the function opencc::MaxMatchSegmentation of the file src/MaxMatchSegmentation.cpp. This manipulation causes heap-based buffer overflow. The attack is restricted to local execution. The exploit has been made available to the public and could be used for attacks. Patch name: 345c9a50ab07018f1b4439776bad78a0d40778ec. To fix this issue, it is recommended to deploy a patch.

References (8)

Core 8

Core References

Third Party Advisory, VDB Entry vdb-entry technical-description

https://vuldb.com/?id.341708

Permissions Required, VDB Entry signature permissions-required

https://vuldb.com/?ctiid.341708

Exploit, Third Party Advisory, VDB Entry third-party-advisory

https://vuldb.com/?submit.733347

Exploit, Patch, Issue Tracking issue-tracking

https://github.com/BYVoid/OpenCC/issues/997

Issue Tracking, Patch issue-tracking

https://github.com/BYVoid/OpenCC/pull/1005

Product exploit

https://github.com/oneafter/1222/blob/main/repro

View Writeup ZIP pw:eip

Patch patch

https://github.com/BYVoid/OpenCC/commit/345c9a50ab07018f1b4439776bad78a0d40778ec

View Patch ZIP pw:eip

Various Sources product

https://github.com/BYVoid/OpenCC/

Scores

CVSS v3 5.3

EPSS 0.0023

EPSS Percentile 13.6%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact partial

Details

CWE

CWE-119 CWE-122 CWE-787

Status published

Products (2)

byvoid/open_chinese_convert < 1.1.9

npm/opencc 0 - 1.2.0npm

Published Jan 18, 2026

Tracked Since Feb 18, 2026