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USN-5156-1: ICU vulnerability

24 November 2021

ICU could be made to crash if it received specially crafted input.



  • icu - International Components for Unicode library


It was discovered that ICU contains a double free issue.
An attacker could use this issue to cause a denial of service or possibly execute arbitrary code.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 21.04
Ubuntu 20.04

In general, a standard system update will make all the necessary changes.