A vulnerability has been discovered and corrected in icu:

A stack-based buffer overflow flaw was found in the way ICU
performed variant canonicalization for some locale identifiers. If a
specially-crafted locale representation was opened in an application
linked against ICU, it could cause the application to crash or,
possibly, execute arbitrary code with the privileges of the user
running the application (CVE-2011-4599).

The updated packages have been patched to correct this issue.