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Ubuntu 25.10 Rack Advisory USN-8182-1 Security Issues and Threats

ubuntu
Calendar Grey April 17, 2026
Dist Ubuntu Esm H88
Discover several critical security issues fixed in Rack for Ubuntu, impacting multiple versions. Update promptly!
Several security issues were fixed in Rack.

Summary

Several security issues were fixed in Rack.

Software Description:

- ruby-rack: modular Ruby webserver interface

Details:

Andrew Lacambra discovered that Rack did not properly parse certain regular

expressions. An attacker could possibly use this issue to bypass network

security filters. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04

LTS, Ubuntu 24.04 LTS, and Ubuntu 25.10. (CVE-2026-26961)

William T. Nelson discovered that Rack did not handle multipart headers

correctly. An attacker could possibly use this issue to cause downstream

parsing issues or a denial of service. This issue only affected Ubuntu

25.10. (CVE-2026-26962)

It was discovered that Rack did not handle the Forwarded header correctly.

An attacker could possibly use this issue to manipulate header values. This

issue only affected Ubuntu 25.10. (CVE-2026-32762)

It was discovered that Rack could consume excessive CPU when handling

certain Accept-Encoding values. An attacker could possibly use this issue

to...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service security issue Ubuntu ruby Rack

Update Instructions

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

Ubuntu 25.10
  ruby-rack                       3.1.16-0.1ubuntu0.3

Ubuntu 24.04 LTS
  ruby-rack                       2.2.7-1ubuntu0.7

Ubuntu 22.04 LTS
  ruby-rack                       2.1.4-5ubuntu1.2+esm3
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  ruby-rack                       2.0.7-2ubuntu0.1+esm10
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  ruby-rack                       1.6.4-4ubuntu0.2+esm10
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  ruby-rack                       1.6.4-3ubuntu0.2+esm10
                                  Available with Ubuntu Pro

Ubuntu 14.04 LTS
  librack-ruby                    1.5.2-3+deb8u3ubuntu1~esm11
                                  Available with Ubuntu Pro
  librack-ruby1.8                 1.5.2-3+deb8u3ubuntu1~esm11
                                  Available with Ubuntu Pro
  librack-ruby1.9.1               1.5.2-3+deb8u3ubuntu1~esm11
                                  Available with Ubuntu Pro
  ruby-rack                       1.5.2-3+deb8u3ubuntu1~esm11
                                  Available with Ubuntu Pro

After a standard system update you need to restart any applications  using
Rack to make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8182-1

CVE-2026-26961, CVE-2026-26962, CVE-2026-32762, CVE-2026-34230,

CVE-2026-34763, CVE-2026-34785, CVE-2026-34786, CVE-2026-34826,

CVE-2026-34827, CVE-2026-34829, CVE-2026-34830, CVE-2026-34831,

CVE-2026-34835

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8182-1

Topics%20covered

Topics Covered

security advisory denial of service security issue Ubuntu ruby Rack

Package Information

https://launchpad.net/ubuntu/+source/ruby-rack/3.1.16-0.1ubuntu0.3
https://launchpad.net/ubuntu/+source/ruby-rack/2.2.7-1ubuntu0.7

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