Cerulean Studios on Monday released a “highly critical” security update for its Trillian multi-protocol chat software.

Attackers could exploit vulnerabilities in the character encoding for Trillian 3.1.5.1–specifically, the word-wrapping handling of UTF-8, the Unicode Transformation Format used for encoding characters in e-mail, instant messages and Web pages, iDefense Labs warned in its security advisory. The vulnerabilities potentially could affect earlier versions of the Trillian software as well, iDefense said.

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