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. (CVE-2022-43680) This update also fixes a minor regression introduced in Ubuntu 18.04 LTS. We apologize for the inconvenience. Original advisory details: Rhodri James discovered that Expat incorrectly handled memory when processing certain malformed XML files. An attacker could possibly use this issue to cause a crash or execute arbitrary code.
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