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CVE-2026-78135

5.6 · MEDIUM

libcharon in strongSwan 5.9.7 through 6.0.7 mishandles behavioral workflow in the IKEv2 state machine.

Published Sep 11, 2026strongswanCWE-841EPSS 0.42%

Overview

CVE-2026-78135 is a medium-severity vulnerability affecting strongswan strongswan. It was published on September 11, 2026 and has a CVSS 3.1 base score of 5.6 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.6, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

libcharon in strongSwan 5.9.7 through 6.0.7 mishandles behavioral workflow in the IKEv2 state machine. Because CREATE_CHILD_SA requests are mishandled, there can be an authentication bypass.

Remediation

Check the references section for vendor advisories and patches from strongswan. Update strongswan to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
strongswanstrongswan5.9.7Affected

References

GitHubgithub.com/strongswan/strongswan/releases/tag/6.1.0Refwww.strongswan.org/blog/2026/09/07/strongswan-vulnerability-(cve-2026-78135).html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-78135?

CVE-2026-78135 is a medium-severity vulnerability affecting strongswan strongswan. It was published on September 11, 2026 and has a CVSS 3.1 base score of 5.6 (MEDIUM).

How severe is CVE-2026-78135?

This vulnerability has a CVSS 3.1 base score of 5.6, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-78135?

Check the references section for vendor advisories and patches from strongswan. Update strongswan to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-78135?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-78135 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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