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[USN-7972-2] OpenCC vulnerability

Posted on 26 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7972-2
May 26, 2026

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

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

Software Description:
- 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:

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

Ubuntu 20.04 LTS
libopencc2 1.0.5+git20190530-1ubuntu0.1~esm1
Available with Ubuntu Pro
opencc 1.0.5+git20190530-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libopencc2 1.0.4-5ubuntu0.1~esm1
Available with Ubuntu Pro
opencc 1.0.4-5ubuntu0.1~esm1
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-7972-2
https://ubuntu.com/security/notices/USN-7972-1
CVE-2025-15536

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