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[USN-7945-1] Libxslt vulnerability

Posted on 07 January 2026
Ubuntu Security

==========================================================================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

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