[USN-7974-1] libxml2 vulnerabilities
[USN-7975-1] pyasn1 vulnerability
[USN-7974-1] libxml2 vulnerabilities
==========================================================================
Ubuntu Security Notice USN-7974-1
January 22, 2026
libxml2 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 25.10
- 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 maliciously crafted SGML
catalog files. An attacker could possibly use this issue to cause libxml2
to consume excessive resources, leading to a denial of service.
(CVE-2025-8732)
It was discovered that libxml2 incorrectly handled recursive include
directories with the RelaxNG parser. An attacker could possibly use this
issue to cause libxml2 to consume excessive resources, leading to a denial
of service. (CVE-2026-0989)
Nick Wellnhofer discovered that libxml2 incorrectly parsed catalogs with
self-referencing URI delegates. An attacker could possibly use this issue
to cause libxml2 to consume excessive resources, leading to a denial of
service. (CVE-2026-0990)
Nick Wellnhofer discovered that libxml2 inefficiently parsed catalogs
linked with repeating nextCatalog elements. An attacker could possibly use
this issue to cause libxml2 to use excessive resources, leading to a denial
of service. (CVE-2026-0992)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 25.10
libxml2-16 2.14.5+dfsg-0.2ubuntu0.1
Ubuntu 24.04 LTS
libxml2 2.9.14+dfsg-1.3ubuntu3.7
Ubuntu 22.04 LTS
libxml2 2.9.13+dfsg-1ubuntu0.11
Ubuntu 20.04 LTS
libxml2 2.9.10+dfsg-5ubuntu0.20.04.10+esm4
Available with Ubuntu Pro
Ubuntu 18.04 LTS
libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm7
Available with Ubuntu Pro
Ubuntu 16.04 LTS
libxml2 2.9.3+dfsg1-1ubuntu0.7+esm12
Available with Ubuntu Pro
Ubuntu 14.04 LTS
libxml2 2.9.1+dfsg1-3ubuntu4.13+esm11
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-7974-1
CVE-2025-8732, CVE-2026-0989, CVE-2026-0990, CVE-2026-0992
Package Information:
https://launchpad.net/ubuntu/+source/libxml2/2.14.5+dfsg-0.2ubuntu0.1
https://launchpad.net/ubuntu/+source/libxml2/2.9.14+dfsg-1.3ubuntu3.7
https://launchpad.net/ubuntu/+source/libxml2/2.9.13+dfsg-1ubuntu0.11
[USN-7975-1] pyasn1 vulnerability
==========================================================================
Ubuntu Security Notice USN-7975-1
January 22, 2026
pyasn1 vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
Summary:
pyasn1 could be made to crash if it received specially crafted input.
Software Description:
- pyasn1: ASN.1 library for Python
Details:
It was discovered that pyasn1 incorrectly handled malformed RELATIVE-OIDs
with excessive continuation octets. An attacker could possibly use this
issue to cause pyasn1 to consume memory, leading to a denial of service.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 25.10
python3-pyasn1 0.6.1-1ubuntu0.1
Ubuntu 24.04 LTS
python3-pyasn1 0.4.8-4ubuntu0.1
Ubuntu 22.04 LTS
python3-pyasn1 0.4.8-1ubuntu0.1
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-7975-1
CVE-2026-23490
Package Information:
https://launchpad.net/ubuntu/+source/pyasn1/0.6.1-1ubuntu0.1
https://launchpad.net/ubuntu/+source/pyasn1/0.4.8-4ubuntu0.1
https://launchpad.net/ubuntu/+source/pyasn1/0.4.8-1ubuntu0.1
