==========================================================================
Ubuntu Security Notice USN-7543-1
May 28, 2025

libsoup3, libsoup2.4 vulnerabilities
==========================================================================

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

- Ubuntu 25.04
- Ubuntu 24.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

libsoup could be made to crash if it received specially crafted network
traffic.

Software Description:
- libsoup2.4: HTTP client/server library for GNOME
- libsoup3: HTTP client/server library for GNOME

Details:

Jan Różański discovered that libsoup incorrectly handled certain headers
when sending HTTP/2 requests over TLS. An attacker could possibly use this
issue to cause a denial of service. This issue only affected libsoup3 in
Ubuntu 24.04 LTS, Ubuntu 24.10, and Ubuntu 25.04. (CVE-2025-32908)

Jan Różański discovered that libsoup incorrectly parsed certain response
headers. An attacker could possibly use this issue to cause a denial of
service. (CVE-2025-4476)

Update instructions:

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

Ubuntu 25.04
  libsoup-2.4-1                   2.74.3-10ubuntu0.3
  libsoup-3.0-0                   3.6.5-1ubuntu0.1

Ubuntu 24.10
  libsoup-2.4-1                   2.74.3-7ubuntu0.5
  libsoup-3.0-0                   3.6.0-2ubuntu0.4

Ubuntu 24.04 LTS
  libsoup-2.4-1                   2.74.3-6ubuntu1.5
  libsoup-3.0-0                   3.4.4-5ubuntu0.4

Ubuntu 22.04 LTS
  libsoup-3.0-0                   3.0.7-0ubuntu1+esm4
                                  Available with Ubuntu Pro
  libsoup2.4-1                    2.74.2-3ubuntu0.5

Ubuntu 20.04 LTS
  libsoup2.4-1                    2.70.0-1ubuntu0.5

Ubuntu 18.04 LTS
  libsoup2.4-1                    2.62.1-1ubuntu0.4+esm4
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  libsoup2.4-1                    2.52.2-1ubuntu0.3+esm3
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-7543-1
  CVE-2025-32908, CVE-2025-4476

Package Information:
  https://launchpad.net/ubuntu/+source/libsoup2.4/2.74.3-10ubuntu0.3
  https://launchpad.net/ubuntu/+source/libsoup3/3.6.5-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/libsoup2.4/2.74.3-7ubuntu0.5
  https://launchpad.net/ubuntu/+source/libsoup3/3.6.0-2ubuntu0.4
  https://launchpad.net/ubuntu/+source/libsoup2.4/2.74.3-6ubuntu1.5
  https://launchpad.net/ubuntu/+source/libsoup3/3.4.4-5ubuntu0.4
  https://launchpad.net/ubuntu/+source/libsoup2.4/2.70.0-1ubuntu0.5