Hiroshi Tokumaru discovered that Ruby did not properly handle certain user input for applications the generate HTTP responses using cgi gem. An attacker could possibly use this issue to maliciously modify the response a user would receive from a vulnerable application. This issue only affected Ubuntu 22.10. (CVE-2021-33621) It was discovered that Ruby incorrectly handled certain regular expressions. An attacker could possibly use this issue to cause a denial of service. (CVE-2023-28755, CVE-2023-28756)
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