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Ubuntu Security Notice USN-7659-1
July 21, 2025

ruby-nokogiri vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in Nokogiri.

Software Description:
- ruby-nokogiri: HTML, XML, SAX, and Reader parser for Ruby

Details:

It was discovered Nokogiri did not correctly parse XML Schemas.
If a user or automated system were tricked into opening a specially
crafted file, an attacker could possibly use this issue to execute
arbitrary code. This issue only affected Ubuntu 20.04 LTS.
(CVE-2020-26247)

Agustin Gianni discovered that Nokogiri did not correctly parse
XML and HTML files. If a user or automated system were tricked into
opening a specially crafted file, an attacker could possibly use this
issue to cause a denial of service or leak sensitive information.
(CVE-2022-29181)

Update instructions:

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

Ubuntu 22.04 LTS
  ruby-nokogiri                   1.13.1+dfsg-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  ruby-nokogiri                   1.10.7+dfsg1-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-7659-1
  CVE-2020-26247, CVE-2022-29181, CVE-2022-40303