Ubuntu Security Notices USN-7972-2 USN-7972-2: OpenCC vulnerability Publication date 26 May 2026 Overview OpenCC could be made to crash if it received specially crafted input. Releases 20.04 LTS 18.04 LTS Packages Details Update instructions References Related notices Packages opencc - simplified-traditional Chinese conversion library Details USN-7972-1 fixed a vulnerability in OpenCC. This update provides the corresponding update for Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. Original advisory details: It was discovered that OpenCC incorrectly handled truncated UTF-8 input. An attacker could possibly use this issue to cause OpenCC to crash, resulting in a denial of service. Update instructions In general, a standard system update will make all the necessary changes. Learn more about how to get the fixes. The problem can be corrected by updating your system to the following package versions: UBUNTU RELEASE PACKAGE VERSION 20.04 LTS focal libopencc2 – 1.0.5+git20190530-1ubuntu0.1~esm1 Ubuntu Pro opencc – 1.0.5+git20190530-1ubuntu0.1~esm1 Ubuntu Pro 18.04 LTS bionic libopencc2 – 1.0.4-5ubuntu0.1~esm1 Ubuntu Pro opencc – 1.0.4-5ubuntu0.1~esm1 Ubuntu Pro Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. Get Ubuntu Pro References CVE-2025-15536 Related notices USN-7972-1