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In the spectrum of critical, I wouldn't put this one towards the top. There's no code execution or privacy or anonymity issues. So yes, upgrading is definitely a fine idea, but it's not a "cancel your dinner plans to do it" sort of situation.
I probably misinterpreted erinn's posts [1][2].
Are tor versions 0.2.3.x and 0.2.4.x affected too?
Yes. I haven't put an 0.2.4.3-alpha out yet (it's an alpha after all). I should probably do that soon.
Thanks for releasing 0.2.4.3-alpha.
[1] https://trac.torproject.org/projects/tor/ticket/6803#comment:9 [2] https://blog.torproject.org/blog/new-bundles-security-release