As long as you subscribe to security advisories, it’s a lot more likely that new vulnerabilities are introduced than old undiscovered vulnerabilities are accide

As long as you subscribe to security advisories, it’s a lot more likely that new vulnerabilities are introduced than old undiscovered vulnerabilities are accidentally patched. In fact barring rewrites (which usually won’t be picked up by semver-respecting auto bumps anyway) I can hardly think of an example of the latter.