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[USN-8787-1] libxml2 vulnerabilities

Posted on 21 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8787-1
September 21, 2026

libxml2 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- 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:

Several security issues were fixed in libxml2.

Software Description:
- libxml2: GNOME XML library

Details:

It was discovered that libxml2 incorrectly handled certain XML elements
under certain circumstances. An attacker could possibly use this issue to
cause libxml2 to crash or execute arbitrary code. (CVE-2026-86140)

It was discovered that libxml2 incorrectly handled certain XML documents
when used with Python bindings. A remote attacker could possibly use this
issue to cause applications using libxml2 to crash, resulting in a denial
of service. (CVE-2026-74860)

Update instructions:

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

Ubuntu 26.04 LTS
libxml2-16 2.15.2+dfsg-0.1ubuntu0.2
libxml2-utils 2.15.2+dfsg-0.1ubuntu0.2
python3-libxml2 2.15.2+dfsg-0.1ubuntu0.2

Ubuntu 24.04 LTS
libxml2 2.9.14+dfsg-1.3ubuntu3.9
libxml2-utils 2.9.14+dfsg-1.3ubuntu3.9
python3-libxml2 2.9.14+dfsg-1.3ubuntu3.9

Ubuntu 22.04 LTS
libxml2 2.9.13+dfsg-1ubuntu0.13
libxml2-utils 2.9.13+dfsg-1ubuntu0.13
python3-libxml2 2.9.13+dfsg-1ubuntu0.13

Ubuntu 20.04 LTS
libxml2 2.9.10+dfsg-5ubuntu0.20.04.10+esm5
Available with Ubuntu Pro
python-libxml2 2.9.10+dfsg-5ubuntu0.20.04.10+esm5
Available with Ubuntu Pro
python3-libxml2 2.9.10+dfsg-5ubuntu0.20.04.10+esm5
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm8
Available with Ubuntu Pro
python-libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm8
Available with Ubuntu Pro
python3-libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm8
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libxml2 2.9.3+dfsg1-1ubuntu0.7+esm13
Available with Ubuntu Pro
libxml2-utils 2.9.3+dfsg1-1ubuntu0.7+esm13
Available with Ubuntu Pro
python-libxml2 2.9.3+dfsg1-1ubuntu0.7+esm13
Available with Ubuntu Pro

Ubuntu 14.04 LTS
libxml2 2.9.1+dfsg1-3ubuntu4.13+esm12
Available with Ubuntu Pro
libxml2-utils 2.9.1+dfsg1-3ubuntu4.13+esm12
Available with Ubuntu Pro
python-libxml2 2.9.1+dfsg1-3ubuntu4.13+esm12
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8787-1
CVE-2026-74860, CVE-2026-86140

Package Information:
https://launchpad.net/ubuntu/+source/libxml2/2.15.2+dfsg-0.1ubuntu0.2
https://launchpad.net/ubuntu/+source/libxml2/2.9.14+dfsg-1.3ubuntu3.9
https://launchpad.net/ubuntu/+source/libxml2/2.9.13+dfsg-1ubuntu0.13

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