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Ubuntu 25.10 Rack Session Important Cookie Access Flaw CVE-2026-39324

ubuntu
Calendar Grey April 23, 2026
Dist Ubuntu Esm H88
Ubuntu Security Notice USN-8190-1 addresses a flaw in Rack::Session allowing unauthorized access via manipulated cookies.
Rack::Session could allow unintended access to network services.

Summary

Rack::Session could allow unintended access to network services.

Software Description:

- ruby-rack-session: Session management implementation for Rack

Details:

SeungMyung Lee discovered that Rack::Session did not properly reject

cookies upon decryption failure. A remote attacker could use this issue to

manipulate session contents and possibly gain unauthorized access.

Topics%20covered

Topics Covered

security advisory unauthorized access Ubuntu important remote attacker rack-session

Update Instructions

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

Ubuntu 25.10
  ruby-rack-session               2.1.1-0.1ubuntu0.1

After a standard system update you need to restart ruby-rack-session to
make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8190-1

CVE-2026-39324

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8190-1

Topics%20covered

Topics Covered

security advisory unauthorized access Ubuntu important remote attacker rack-session

Package Information

https://launchpad.net/ubuntu/+source/ruby-rack-session/2.1.1-0.1ubuntu0.1

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