[USN-7972-1] OpenCC vulnerability

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Ubuntu Security Notice USN-7972-1
January 21, 2026

opencc vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

OpenCC could be made to crash if it received specially crafted input.

Software Description:
- opencc: simplified-traditional Chinese conversion library

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:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
libopencc1.1 1.1.9+ds1-2ubuntu0.1
opencc 1.1.9+ds1-2ubuntu0.1

Ubuntu 24.04 LTS
libopencc1.1 1.1.7+ds1-1ubuntu0.1
opencc 1.1.7+ds1-1ubuntu0.1

Ubuntu 22.04 LTS
libopencc1.1 1.1.3+ds1-3ubuntu3.1
opencc 1.1.3+ds1-3ubuntu3.1

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7972-1
CVE-2025-15536

Package Information:
https://launchpad.net/ubuntu/+source/opencc/1.1.9+ds1-2ubuntu0.1
https://launchpad.net/ubuntu/+source/opencc/1.1.7+ds1-1ubuntu0.1
https://launchpad.net/ubuntu/+source/opencc/1.1.3+ds1-3ubuntu3.1