It was discovered that the Django URLValidator function incorrectly handled newlines and tabs. A remote attacker could possibly use this issue to perform a header injection attack. This issue only affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-32052) Rasmus Lerchedahl Petersen and Rasmus Wriedt Larsen discovered that Django incorrectly handled path sanitation in admindocs. A remote attacker could possibly use this issue to determine the existence of arbitrary files and in certain configurations obtain their contents. (CVE-2021-33203) It was discovered that Django incorrectly handled IPv4 addresses with leading zeros. A remote attacker could possibly use this issue to perform a wide variety of attacks, including bypassing certain access restrictions. (CVE-2021-33571)
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