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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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