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[USN-8890-2] libsoup vulnerabilities

Posted on 22 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8890-2
October 21, 2026

libsoup3 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.10

Summary:

Several security issues were fixed in libsoup.

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

Details:

USN-8890-1 fixed vulnerabilities in libsoup. This update provides the
corresponding updates for libsoup3 on Ubuntu 26.10.

Original advisory details:

It was discovered that libsoup incorrectly handled certain HTTP/2
requests.
A remote attacker could possibly use this issue to cause a denial of
service. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS.
(CVE-2026-4271)

It was discovered that libsoup incorrectly handled certain HTTPS proxy
connections. A remote attacker could possibly use this issue to obtain
sensitive information. This issue only affected Ubuntu 22.04 LTS, Ubuntu
24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-5119)

It was discovered that libsoup incorrectly parsed certain chunked HTTP
requests. A remote attacker could possibly use this issue to bypass
security controls. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04
LTS, and Ubuntu 26.04 LTS. (CVE-2026-6324)

It was discovered that libsoup incorrectly handled proxy authentication
credentials. A remote attacker could possibly use this issue to obtain
sensitive information. (CVE-2026-66339)

It was discovered that libsoup incorrectly handled certain HTTP Range
headers. A remote attacker could possibly use this issue to cause a denial
of service. (CVE-2026-77014, CVE-2026-77680)

It was discovered that libsoup incorrectly handled certain HTTP/2
connections. A remote attacker could possibly use this issue to obtain
sensitive information or execute arbitrary code. This issue only affected
Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-85197)

It was discovered that libsoup incorrectly handled certain HTTP/2
transfers. A remote attacker could possibly use this issue to cause a
denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04
LTS, and Ubuntu 26.04 LTS. (CVE-2026-85534)

Update instructions:

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

Ubuntu 26.10
gir1.2-soup-3.0 3.6.6-1ubuntu3
libsoup-3.0-0 3.6.6-1ubuntu3
libsoup-3.0-common 3.6.6-1ubuntu3
libsoup-3.0-dev 3.6.6-1ubuntu3
libsoup-3.0-doc 3.6.6-1ubuntu3
libsoup-3.0-tests 3.6.6-1ubuntu3

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

References:
https://ubuntu.com/security/notices/USN-8890-2
https://ubuntu.com/security/notices/USN-8890-1
CVE-2026-4271, CVE-2026-5119, CVE-2026-6324, CVE-2026-66339,
CVE-2026-77014, CVE-2026-77680, CVE-2026-85197, CVE-2026-85534

Package Information:
https://launchpad.net/ubuntu/+source/libsoup3/3.6.6-1ubuntu3

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