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Ubuntu 20.04 LTS: Ruby Important REXML Denial Of Service USN-7840-1

ubuntu
Calendar Grey October 27, 2025
Dist Ubuntu Esm H88
Several security issues in Ruby for Ubuntu affect multiple LTS releases, requiring immediate updates to mitigate risks.
Several security issues were fixed in Ruby.

Summary

Several security issues were fixed in Ruby.

Software Description:

- ruby2.7: Object-oriented scripting language

- ruby2.5: Object-oriented scripting language

- ruby2.3: Object-oriented scripting language

Details:

It was discovered that the REXML module bunded into Ruby incorrectly

handled parsing XML documents with repeated instances of certain

characters. An attacker could possibly use this issue to cause REXML to

consume excessive resources, leading to a denial of service. Ubuntu 18.04

LTS and Ubuntu 20.04 LTS were previously addressed in USN-7256-1 and

USN-7734-1. This update addresses the issue in Ubuntu 16.04 LTS.

(CVE-2024-35176)

It was discovered that the REXML module bunded into Ruby incorrectly

handled parsing XML documents with repeated instances of certain

characters. An attacker could possibly use this issue to cause REXML to

consume excessive resources, leading to a denial of service. Ubuntu 20.04

LTS was previously addressed in USN-7256-1. This update addresses th...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important ruby REXML

Update Instructions

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

Ubuntu 20.04 LTS
  libruby2.7                      2.7.0-5ubuntu1.18+esm3
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  libruby2.5                      2.5.1-1ubuntu1.16+esm6
                                  Available with Ubuntu Pro
  ruby2.5                         2.5.1-1ubuntu1.16+esm6
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  libruby2.3                      2.3.1-2~ubuntu16.04.16+esm11
                                  Available with Ubuntu Pro
  ruby2.3                         2.3.1-2~ubuntu16.04.16+esm11
                                  Available with Ubuntu Pro

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

References

https://ubuntu.com/security/notices/USN-7840-1

CVE-2024-35176, CVE-2024-39908, CVE-2024-41123, CVE-2024-41946,

CVE-2024-47220, CVE-2025-6442

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7840-1

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important ruby REXML

Package Information

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