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USN-5355-1: zlib vulnerability

30 March 2022

zlib could be made to crash or run programs if it received specially crafted input.



  • zlib - Lossless data-compression library


Danilo Ramos discovered that zlib incorrectly handled memory when
performing certain deflating operations. An attacker could use this issue
to cause zlib to crash, resulting in 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 21.10
Ubuntu 20.04
Ubuntu 18.04

After a standard system update you need to reboot your computer to make
all the necessary changes.


Related notices

  • USN-5355-2: lib64z1-dev, libx32z1, zlib-bin, libx32z1-dev, lib32z1-dev, lib64z1, zlib, zlib1g, zlib1g-dev, lib32z1
  • USN-5359-1: rsync
  • USN-5359-2: rsync