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[USN-8022-1] Expat vulnerabilities

Posted on 11 February 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8022-1
February 10, 2026

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

- Ubuntu 25.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Expat.

Software Description:
- expat: XML parsing C library

Details:

It was discovered that Expat incorrectly handled memory when parsing certain
XML files. An attacker could possibly use this issue to cause a denial of
service. This issue was only addressed in Ubuntu 25.10. (CVE-2025-59375)

It was discovered that Expat incorrectly handled the initialization of parsers
for external entities. An attacker could possibly use this issue to cause a
denial of service. (CVE-2026-24515)

It was discovered that Expat incorrectly handled integer calculations when
allocating memory for XML tags. An attacker could possibly use this issue to
cause a denial of service or execute arbitrary code. (CVE-2026-25210)

Update instructions:

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

Ubuntu 25.10
expat 2.7.1-2ubuntu0.2
libexpat1 2.7.1-2ubuntu0.2

Ubuntu 22.04 LTS
expat 2.4.7-1ubuntu0.7
libexpat1 2.4.7-1ubuntu0.7

Ubuntu 20.04 LTS
expat 2.2.9-1ubuntu0.8+esm1
Available with Ubuntu Pro
libexpat1 2.2.9-1ubuntu0.8+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
expat 2.2.5-3ubuntu0.9+esm3
Available with Ubuntu Pro
libexpat1 2.2.5-3ubuntu0.9+esm3
Available with Ubuntu Pro

Ubuntu 16.04 LTS
expat 2.1.0-7ubuntu0.16.04.5+esm11
Available with Ubuntu Pro
lib64expat1 2.1.0-7ubuntu0.16.04.5+esm11
Available with Ubuntu Pro
libexpat1 2.1.0-7ubuntu0.16.04.5+esm11
Available with Ubuntu Pro

Ubuntu 14.04 LTS
expat 2.1.0-4ubuntu1.4+esm11
Available with Ubuntu Pro
lib64expat1 2.1.0-4ubuntu1.4+esm11
Available with Ubuntu Pro
libexpat1 2.1.0-4ubuntu1.4+esm11
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8022-1
CVE-2025-59375, CVE-2026-24515, CVE-2026-25210

Package Information:
https://launchpad.net/ubuntu/+source/expat/2.7.1-2ubuntu0.2
https://launchpad.net/ubuntu/+source/expat/2.4.7-1ubuntu0.7

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