CVE-2026-78135

Authentication Bypass via CREATE_CHILD_SA in strongSwan IKEv2

Published Sep 11, 2026 CVSS 3.1 · 5.6 Medium EPSS < 1% KEV · Not listed
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

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4879-1 strongswan security update
Debian DSA Debian DSA DSA-6487-1 strongswan security update
Ubuntu USN Ubuntu USN USN-8789-1 strongSwan vulnerabilities
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Authentication Bypass via CREATE_CHILD_SA in strongSwan IKEv2
Type Values Removed Values Added
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.
First Time appeared Strongswan
Strongswan strongswan
Weaknesses CWE-841
CPEs cpe:2.3:a:strongswan:strongswan:*:*:*:*:*:*:*:*
Vendors & Products Strongswan
Strongswan strongswan
References
Metrics cvssV3_1

{'score': 5.6, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Sep 15, 2026, 3:32 PM
Reserved
Aug 22, 2026, 11:41 PM
Status
Analyzed
Published
Sep 11, 2026, 3:16 AM
Modified
Sep 16, 2026, 7:37 PM