Advisory Published

USN-7504-1: LibreOffice vulnerability

First published: Thu May 08 2025(Updated: )

Juraj Šarinay discovered that LibreOffice incorrectly handled verifying PDF signatures. A remote attacker could possibly use this issue to generate PDF files that appear to have a valid signature.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libreoffice<4:24.8.6-0ubuntu0.24.10.2
4:24.8.6-0ubuntu0.24.10.2
Ubuntu=24.10
All of
ubuntu/libreoffice<4:24.2.7-0ubuntu0.24.04.4
4:24.2.7-0ubuntu0.24.04.4
Ubuntu=24.04
All of
ubuntu/libreoffice<1:7.3.7-0ubuntu0.22.04.10
1:7.3.7-0ubuntu0.22.04.10
Ubuntu=22.04
All of
ubuntu/libreoffice<1:6.4.7-0ubuntu0.20.04.15
1:6.4.7-0ubuntu0.20.04.15
Ubuntu=20.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-7504-1?

    The severity of USN-7504-1 is critical due to the potential for remote attackers to forge PDF signatures.

  • How do I fix USN-7504-1?

    To fix USN-7504-1, update LibreOffice to the latest version specified in the advisory for your Ubuntu version.

  • What versions of LibreOffice are affected by USN-7504-1?

    USN-7504-1 affects multiple versions of LibreOffice across various Ubuntu releases including 24.10, 24.04, 22.04, and 20.04.

  • Can USN-7504-1 be exploited remotely?

    Yes, USN-7504-1 can be exploited remotely as the vulnerability allows attackers to create malicious PDF files with forged signatures.

  • What should I do if I am unable to update LibreOffice for USN-7504-1?

    If you cannot update LibreOffice, avoid opening untrusted PDF files until the issue is resolved.

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