CVE-2026-78135 PUBLISHED

Assigner: mitre
Reserved: 22.08.2026 Published: 11.09.2026 Updated: 11.09.2026

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.

Metrics

CVSS 3.1

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

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	Low
User Interaction	None	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	strongSwan
Product	strongSwan
Versions	Default: unaffected affected from 5.9.7 to 6.1.0 (excl.)

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

Problem Types

CWE-841 Improper Enforcement of Behavioral Workflow CWE