Ubuntu alert USN-8196-1 (strongswan)

From:
             
 
noreply+usn-bot@canonical.com
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8196-1] strongSwan vulnerabilities
Date:
             
 
Wed, 22 Apr 2026 13:18:00 +0000
Message-ID:
             
 
<E1wFXSq-0002yp-6d@lists.ubuntu.com>
==========================================================================
Ubuntu Security Notice USN-8196-1
April 22, 2026

strongswan vulnerabilities
==========================================================================

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

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in strongSwan.

Software Description:
- strongswan: IPsec VPN solution

Details:

Haruto Kimura discovered that strongSwan incorrectly handled the
supported_versions extension in TLS. A remote attacker could possibly use
this issue to cause strongSwan to stop responding, resulting in a denial
of service. (CVE-2026-35328)

Haruto Kimura discovered that strongSwan incorrectly handled certain
encrypted PKCS#7 containers. A remote attacker could possibly use this
issue to cause strongSwan to crash, resulting in a denial of service.
(CVE-2026-35329)

Lukas Johannes Moeller discovered that strongSwan incorrectly handled
certain EAP-SIM/AKA attributes. A remote attacker could use this issue to
cause strongSwan to stop responding, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2026-35330)

Haruto Kimura discovered that strongSwan incorrectly handled processing of
X.509 name constraints. A remote attacker could possibly use this issue to
bypass excluded name constraints. (CVE-2026-35331)

Haruto Kimura discovered that strongSwan incorrectly processed ECDH public
values. A remote attacker could possibly use this issue to cause strongSwan
to crash, resulting in a denial of service. (CVE-2026-35332)

Lukas Johannes Moeller discovered that strongSwan incorrectly handled
certain RADIUS attributes. A remote attacker could possibly use this issue
to cause strongSwan to crash, resulting in a denial of service.
(CVE-2026-35333)

Ryo Shimada discovered that strongSwan incorrectly handled RSA decryption.
A remote attacker could possibly use this issue to cause strongSwan to
crash, resulting in a denial of service. (CVE-2026-35334)

Update instructions:

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

Ubuntu 25.10
  libstrongswan                   6.0.1-6ubuntu4.3
  strongswan                      6.0.1-6ubuntu4.3

Ubuntu 24.04 LTS
  libstrongswan                   5.9.13-2ubuntu4.24.04.3
  strongswan                      5.9.13-2ubuntu4.24.04.3

Ubuntu 22.04 LTS
  libstrongswan                   5.9.5-2ubuntu2.6
  strongswan                      5.9.5-2ubuntu2.6

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

References:
  https://ubuntu.com/security/notices/USN-8196-1
  CVE-2026-35328, CVE-2026-35329, CVE-2026-35330, CVE-2026-35331,
  CVE-2026-35332, CVE-2026-35333, CVE-2026-35334

Package Information:
  https://launchpad.net/ubuntu/+source/strongswan/6.0.1-6ub...
  https://launchpad.net/ubuntu/+source/strongswan/5.9.13-2u...
  https://launchpad.net/ubuntu/+source/strongswan/5.9.5-2ub...


Attachment: signature.asc (type=application/pgp-signature)
-----BEGIN PGP SIGNATURE-----
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=NNsy
-----END PGP SIGNATURE-----