Botan 1.8.13 has been released with a fix for a recently discovered bug that could cause crashes in multithreaded code.
A full description of the problem can be found on the mailing list: http://lists.randombit.net/pipermail/botan-devel/2011-July/001455.html
Update to the latest version of the 1.8 series, 1.8.12.
Relevant items from the upstream changelog:
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