Tumblr released updated Tumblr v3.4.1 for iPhone, iPod Touch and iPad that includes very important patch for security flaw and there are no new features included to the updated app. According to the official Tumblr blog:
“We have just released a very important security update for our iPhone and iPad apps addressing an issue that allowed passwords to be compromised in certain circumstances¹. Please download the update now.
If you’ve been using these apps, you should also update your password on Tumblr and anywhere else you may have been using the same password. It’s also good practice to use different passwords across different services by using an app like 1Password or LastPass.
Please know that we take your security very seriously and are tremendously sorry for this lapse and inconvenience.”