Be aware that there is likely someone over there who thinks it's serious and worth fixing, but their manager won't let them fix it because their manager doesn't think it's an issue and would rather invest in features and make more money for the business.

If you release it, you force the manager to do the right thing, and the developer will then be officially allowed time to fix it.

Give them a deadline and drop it. Even ZDI does this now. Some companies will sit on reports for years, because no one cares.