NSA and GCHQ agents 'leak Tor bugs', alleges developer
bbc.com
bbc.com
We already know that Tor is first and foremost a scheme to enable U.S. covert and clandestine operations, so it wouldn't be that surprising to see the USG trying to fine tune the balance of Tor security to be breakable against bugs only they possess while ironclad against vulnerabilities known to the rest of the world.
> However, he acknowledged that because of the way the Tor Project received such information, he could not prove who had sent it.
> "It's a hunch," he said.
Perhaps they only anonymously report the bugs that they detect someone else potentially exploiting? I'm sure they would try to maintain their ability to try and break the protocol, but perhaps if they think some other (non five-eyes intelligence) actor has discovered the vulnerability then they report it.
(Edit: The submitted title was "NSA, GCHQ agents deliberately undermining Tor surveillance efforts by NSA, GCHQ". Was in a rush and forgot to mention it earlier.)