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Ubuntu 25.10: Rack Critical DoS Risk Fix USN-7960-1 CVE-2025-59830

ubuntu
Calendar Grey January 15, 2026
Dist Ubuntu Esm H88
Several security issues in Rack were fixed for multiple Ubuntu releases with potential denial of service and memory exhaustion risks.
Several security issues were fixed in Rack.

Summary

Several security issues were fixed in Rack.

Software Description:

- ruby-rack: modular Ruby webserver interface

Details:

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 h...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu memory exhaustion ruby rack proxy restriction

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
  ruby-rack                       3.1.16-0.1ubuntu0.1

Ubuntu 24.04 LTS
  ruby-rack                       2.2.7-1ubuntu0.5

Ubuntu 22.04 LTS
  ruby-rack                       2.1.4-5ubuntu1.2

Ubuntu 20.04 LTS
  ruby-rack                       2.0.7-2ubuntu0.1+esm8
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  ruby-rack                       1.6.4-4ubuntu0.2+esm9
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  ruby-rack                       1.6.4-3ubuntu0.2+esm9
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-7960-1

CVE-2025-59830, CVE-2025-61770, CVE-2025-61771, CVE-2025-61772,

CVE-2025-61780, CVE-2025-61919

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7960-1

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu memory exhaustion ruby rack proxy restriction

Package Information

https://launchpad.net/ubuntu/+source/ruby-rack/3.1.16-0.1ubuntu0.1
https://launchpad.net/ubuntu/+source/ruby-rack/2.2.7-1ubuntu0.5
https://launchpad.net/ubuntu/+source/ruby-rack/2.1.4-5ubuntu1.2

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