[USN-8515-1] Addressable vulnerability

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Ubuntu Security Notice USN-8515-1
July 07, 2026

ruby-addressable vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Addressable could be made to consume resources and cause a denial of
service if it received specially crafted input.

Software Description:
- ruby-addressable: Addressable is an alternative implementation to the URI implementation that is part of Ruby's standard library

Details:

It was discovered that Addressable incorrectly handled certain URI
templates, generating regular expressions vulnerable to catastrophic
backtracking. An attacker could use this issue to craft a URI that, when matched
against a vulnerable template, causes excessive resource consumption,
leading to a denial of service.

Update instructions:

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

Ubuntu 26.04 LTS
  ruby-addressable                2.8.7-2ubuntu0.26.04.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 24.04 LTS
  ruby-addressable                2.8.5-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 22.04 LTS
  ruby-addressable                2.8.0-3ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  ruby-addressable                2.7.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  ruby-addressable                2.5.2-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  ruby-addressable                2.3.8-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-8515-1
  CVE-2026-35611
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