CVE-2025-15536

Publication date 18 January 2026

Last updated 21 January 2026

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
opencc	25.10 questing	Fixed 1.1.9+ds1-2ubuntu0.1
	24.04 LTS noble	Fixed 1.1.7+ds1-1ubuntu0.1
	22.04 LTS jammy	Fixed 1.1.3+ds1-3ubuntu3.1
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
opencc	Upstream: 345c9a5

Severity score breakdown

Parameter	Value
Base score	5.3 · Medium
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	Low
Availability impact	Low
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

References

Related Ubuntu Security Notices (USN)

USN-7972-1
OpenCC vulnerability
21 January 2026