CVE-2026-78135: 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.

Overview

Severity

Medium (CVSS 5.6)

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Exploit Status

Not Exploited

Patch Tuesday

2026-Sep

Released

2026-09-12

EPSS Score

0.34% (percentile: 26.7%)

Affected Products (1)

Other

• 21867-17084

Security Updates (1)

• Security Update

Revision History

• 2026-09-12: Information published.