expat: XML parsing C library Details: USN-5638-1 fixed a vulnerability in Expat. This update provides the corresponding updates for Ubuntu 16.04 ESM, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 22.10. This update also fixes a minor regression introduced in Ubuntu 18.04 LTS. We apologize for the inconvenience. Original advisory Expat could be made to crash or execute arbitrary code.