CVE-2025-15536

BYVoid OpenCC MaxMatchSegmentation.cpp MaxMatchSegmentation heap-based overflow

State: Published
Severity: 4.8 Medium
Published: Jan 18, 2026
Updated: Feb 23, 2026
Reserved: Jan 17, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	4.8 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P	VulDB
3.1	5.3 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C	VulDB
3.0	5.3 Medium	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C	VulDB
2.0	4.3 Medium	AV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C	VulDB

Weaknesses

CWE-122 Heap-based Buffer Overflow
CWE-119 Memory Corruption

Affected Products

Product	Versions
OpenCCBYVoid	1.1.0Affected 1.1.1Affected 1.1.2Affected 1.1.3Affected 1.1.4Affected 1.1.5Affected 1.1.6Affected 1.1.7Affected 1.1.8Affected 1.1.9Affected

References

VDB-341708 | BYVoid OpenCC MaxMatchSegmentation.cpp MaxMatchSegmentation heap-based overflowvdb-entrytechnical-description
VDB-341708 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
Submit #733347 | BYVoid OpenCC ver.1.1.9 and master-branch Heap-based Buffer Overflowthird-party-advisory
https://github.com/BYVoid/OpenCC/issues/997issue-tracking
https://github.com/BYVoid/OpenCC/pull/1005issue-tracking
https://github.com/oneafter/1222/blob/main/reproexploit
https://github.com/BYVoid/OpenCC/commit/345c9a50ab07018f1b4439776bad78a0d40778ecpatch
https://github.com/BYVoid/OpenCC/product

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