Ubuntu: USN-7960-1 (CVE-2025-61780): Rack vulnerabilities

It was discovered that Rack incorrectly handled certain query parameters.
An attacker could possibly use this issue to cause a limited denial of
service. This issue was only addressed in Ubuntu 20.04 LTS and
Ubuntu 22.04 LTS. (CVE-2025-59830)

It was discovered that Rack did not properly handle certain multipart
form data. An attacker could possibly use this issue to cause memory
exhaustion, leading to a denial of service. This issue was only addressed
in Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 25.10.
(CVE-2025-61770, CVE-2025-61772)

It was discovered that Rack did not properly handle certain form fields.
An attacker could possibly use this issue to cause memory exhaustion,
leading to a denial of service. This issue was only addressed in Ubuntu
22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 25.10. (CVE-2025-61771)

It was discovered that Rack did not properly handle certain headers. An
attacker could possibly use this issue to bypass proxy access
restrictions and obtain sensitive information. (CVE-2025-61780)

Tomoya Yamashita discovered that Rack did not properly manage memory
under certain circumstances. An attacker could possibly use this issue to
cause memory exhaustion, leading to a denial of service. This issue was
only addressed in Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS
and Ubuntu 25.10. (CVE-2025-61919)