CVE-2026-78135

State: Published
Severity: 5.6 Medium
Published: Sep 11, 2026
Updated: Sep 15, 2026
Reserved: Aug 22, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.6 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L	mitre

Weaknesses

CWE-841 Improper Enforcement of Behavioral Workflow

Affected Products

Product	Versions
strongSwanstrongSwan	5.9.7 to before 6.1.0Affected

References

https://github.com/strongswan/strongswan/releases/tag/6.1.0
https://www.strongswan.org/blog/2026/09/07/strongswan-vulnerability-(cve-2026-78135).html

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