Ubuntu Security Update USN-5081-1: Qt vulnerabilities

[LinuxBot]

It was discovered that Qt incorrectly handled certain XBM image files. If a user or automated system were tricked into opening a specially crafted PPM file, a remote attacker could cause Qt to crash, resulting in a denial of service. (CVE-2020-17507) It was discovered that Qt incorrectly handled certain graphics operations. If a user or automated system were tricked into performing certain graphics operations, a remote attacker could cause Qt to crash, resulting in a denial of service. (CVE-2021-38593)

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