Debian Security Advisory 1889-1 – It was discovered that the ICU unicode library performed incorrect processing of invalid multibyte sequences, resulting in potential bypass of security mechanisms.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/81386/dsa-1889-1.txt
Source: https://packetstormsecurity.com/files/81386/Debian-Linux-Security-Advisory-1889-1.html