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Ubuntu 25.10 strongSwan Important Denial Of Service USN-8196-1

ubuntu
Calendar Grey April 22, 2026
Dist Ubuntu Esm H88
Several security issues in strongSwan require immediate updates on Ubuntu distributions to prevent denial of service attacks.
Several security issues were fixed in strongSwan.

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...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service remote attack Ubuntu important strongSwan

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

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8196-1

Topics%20covered

Topics Covered

security advisory denial of service remote attack Ubuntu important strongSwan

Package Information

https://launchpad.net/ubuntu/+source/strongswan/6.0.1-6ubuntu4.3
https://launchpad.net/ubuntu/+source/strongswan/5.9.13-2ubuntu4.24.04.3
https://launchpad.net/ubuntu/+source/strongswan/5.9.5-2ubuntu2.6

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