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Ubuntu 25.04: Libxslt Critical Denial of Service CvE-2025-7424

Calendar Jan 07, 2026 • User Avatar LinuxSecurity Advisories
1 - 2 min read
Ubuntu Large Esm H500
Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu libxslt type confusion
Libxslt could be made to crash or exhibit undefined behavior if it opened a specially crafted file. 
==========================================================================
Ubuntu Security Notice USN-7945-1
January 07, 2026

libxslt vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Libxslt could be made to crash or exhibit undefined behavior if it opened a
specially crafted file.

Software Description:
- libxslt: XSLT processing library

Details:

Ivan Fratric discovered that Libxslt was vulnerable to type confusion when
performing XML transformations. An attacker could possibly use this issue
to cause Libxslt to crash or corrupt memory, causing a denial of service or
undefined behavior.

Update instructions:

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

Ubuntu 25.04
  libxslt1.1                      1.1.39-0exp1ubuntu4.1
  xsltproc                        1.1.39-0exp1ubuntu4.1

Ubuntu 24.04 LTS
  libxslt1.1                      1.1.39-0exp1ubuntu0.24.04.3
  xsltproc                        1.1.39-0exp1ubuntu0.24.04.3

Ubuntu 22.04 LTS
  libxslt1.1                      1.1.34-4ubuntu0.22.04.5
  xsltproc                        1.1.34-4ubuntu0.22.04.5

Ubuntu 20.04 LTS
  libxslt1.1                      1.1.34-4ubuntu0.20.04.3+esm2
                                  Available with Ubuntu Pro
  xsltproc                        1.1.34-4ubuntu0.20.04.3+esm2
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  libxslt1.1                      1.1.29-5ubuntu0.3+esm3
                                  Available with Ubuntu Pro
  xsltproc                        1.1.29-5ubuntu0.3+esm3
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  libxslt1.1                      1.1.28-2.1ubuntu0.3+esm4
                                  Available with Ubuntu Pro
  xsltproc                        1.1.28-2.1ubuntu0.3+esm4
                                  Available with Ubuntu Pro

Ubuntu 14.04 LTS
  libxslt1.1                      1.1.28-2ubuntu0.2+esm5
                                  Available with Ubuntu Pro
  xsltproc                        1.1.28-2ubuntu0.2+esm5
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-7945-1
  CVE-2025-7424

Package Information:
  https://launchpad.net/ubuntu/+source/libxslt/1.1.39-0exp1ubuntu4.1
  https://launchpad.net/ubuntu/+source/libxslt/1.1.39-0exp1ubuntu0.24.04.3
  https://launchpad.net/ubuntu/+source/libxslt/1.1.34-4ubuntu0.22.04.5

Ubuntu 25.04: Libxslt Critical Denial of Service CvE-2025-7424

ubuntu
Calendar Grey January 7, 2026
Dist Ubuntu Esm H88
Libxslt exhibits undefined behavior when opening crafted files, leading to a severe denial of service risk. Immediate updates recommended.
Libxslt could be made to crash or exhibit undefined behavior if it opened a specially crafted file.

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 25.04 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS Summary: Libxslt could be made to crash or exhibit undefined behavior if it opened a specially crafted file. Software Description: - libxslt: XSLT processing library Details: Ivan Fratric discovered that Libxslt was vulnerable to type confusion when performing XML transformations. An attacker could possibly use this issue to cause Libxslt to crash or corrupt memory, causing a denial of service or undefined behavior.

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu libxslt type confusion

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 25.04 libxslt1.1 1.1.39-0exp1ubuntu4.1 xsltproc 1.1.39-0exp1ubuntu4.1 Ubuntu 24.04 LTS libxslt1.1 1.1.39-0exp1ubuntu0.24.04.3 xsltproc 1.1.39-0exp1ubuntu0.24.04.3 Ubuntu 22.04 LTS libxslt1.1 1.1.34-4ubuntu0.22.04.5 xsltproc 1.1.34-4ubuntu0.22.04.5 Ubuntu 20.04 LTS libxslt1.1 1.1.34-4ubuntu0.20.04.3+esm2 Available with Ubuntu Pro xsltproc 1.1.34-4ubuntu0.20.04.3+esm2 Available with Ubuntu Pro Ubuntu 18.04 LTS libxslt1.1 1.1.29-5ubuntu0.3+esm3 Available with Ubuntu Pro xsltproc 1.1.29-5ubuntu0.3+esm3 Available with Ubuntu Pro Ubuntu 16.04 LTS libxslt1.1 1.1.28-2.1ubuntu0.3+esm4 Available with Ubuntu Pro xsltproc 1.1.28-2.1ubuntu0.3+esm4 Available with Ubuntu Pro Ubuntu 14.04 LTS libxslt1.1 1.1.28-2ubuntu0.2+esm5 Available with Ubuntu Pro xsltproc 1.1.28-2ubuntu0.2+esm5 Available with Ubuntu Pro In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-7945-1

CVE-2025-7424

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7945-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu libxslt type confusion

Package Information

https://launchpad.net/ubuntu/+source/libxslt/1.1.39-0exp1ubuntu4.1 https://launchpad.net/ubuntu/+source/libxslt/1.1.39-0exp1ubuntu0.24.04.3 https://launchpad.net/ubuntu/+source/libxslt/1.1.34-4ubuntu0.22.04.5

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