high
7.5
CWE
1333
Advisory Published
CVE Published
Updated

CVE-2024-49761: REXML ReDoS vulnerability

First published: Mon Oct 28 2024(Updated: )

### Impact The REXML gem before 3.3.9 has a ReDoS vulnerability when it parses an XML that has many digits between `&#` and `x...;` in a hex numeric character reference (`&#x...;`). This does not happen with Ruby 3.2 or later. Ruby 3.1 is the only affected maintained Ruby. Note that Ruby 3.1 will reach EOL on 2025-03. ### Patches The REXML gem 3.3.9 or later include the patch to fix the vulnerability. ### Workarounds Use Ruby 3.2 or later instead of Ruby 3.1. ### References * https://www.ruby-lang.org/en/news/2024/10/28/redos-rexml-cve-2024-49761/: An announce on www.ruby-lang.org

Credit: security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
rubygems/rexml<3.3.9
3.3.9
REXML Ruby<3.3.9
debian/ruby2.7<=2.7.4-1+deb11u1
2.7.4-1+deb11u5
debian/ruby3.1<=3.1.2-7+deb12u1<=3.1.2-8.5
debian/ruby3.3<=3.3.7-1

Remedy

https://github.com/ruby/rexml/commit/ce59f2eb1aeb371fe1643414f06618dbe031979f

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2024-49761?

    CVE-2024-49761 is categorized as a ReDoS vulnerability which may lead to denial of service due to excessive resource consumption during XML parsing.

  • How do I fix CVE-2024-49761?

    To mitigate CVE-2024-49761, upgrade the REXML gem to version 3.3.9 or later.

  • Which versions of Ruby are affected by CVE-2024-49761?

    CVE-2024-49761 affects the REXML gem versions prior to 3.3.9, specifically impacting Ruby 3.1 and earlier.

  • Is CVE-2024-49761 present in Ruby 3.2 or later?

    No, CVE-2024-49761 is not present in Ruby 3.2 or later versions.

  • What is the impact of CVE-2024-49761 on applications using the REXML gem?

    CVE-2024-49761 can lead to a denial of service for applications that use the vulnerable REXML gem for XML parsing.

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