Systems | Development | Analytics | API | Testing

If you’ve recently upgraded to Debian 13 (“Trixie”) or a newer version of Ubuntu and suddenly started seeing security warnings when running apt update (or apt update --audit), don’t worry. You didn’t do anything wrong. This is a side effect of a broader security change across modern Linux distributions. SHA-1 signatures are being deprecated, and repositories that still rely on them may now trigger warnings or audits.

Modern software systems are exposed to a constant stream of disclosed vulnerabilities. Thousands of new issues are published every year across operating systems, runtimes, libraries, and frameworks. Treating all of them as equally urgent is not realistic, and trying to do so often leads to ineffective security work. To manage this volume, the security community relies on two foundational mechanisms: CVE and CVSS.