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USN-4968-1: LZ4 vulnerability

26 May 2021

LZ4 could be made to crash or run programs if it opened a specially crafted file.



  • lz4 - Extremely fast compression algorithm


It was discovered that LZ4 incorrectly handled certain memory operations.
If a user or automated system were tricked into uncompressing a specially-
crafted LZ4 file, a remote attacker could use this issue to cause LZ4 to
crash, resulting in a denial of service, or possibly execute arbitrary

Update instructions

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

Ubuntu 21.04
Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04

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


Related notices

  • USN-4968-2: liblz4-dev, liblz4-1, liblz4-tool, lz4