CVE-2026-78135

EUVD-2026-75921
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.6 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 36.41%
Affected Products (NVD)
VendorProductVersion
strongswanstrongswan
5.9.7 ≤
𝑥
≤ 6.0.7
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
strongswan
bookworm
vulnerable
bookworm (security)
vulnerable
forky
6.1.0-2
fixed
sid
6.1.0-2
fixed
trixie
vulnerable
trixie (security)
6.0.1-6+deb13u7
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
strongswan
bionic
needs-triage
focal
needs-triage
jammy
Fixed in 5.9.5-2ubuntu2.8
released
noble
Fixed in 5.9.13-2ubuntu4.24.04.5
released
resolute
Fixed in 6.0.4-1ubuntu3.2
released
stonking
not-affected
trusty
needs-triage
xenial
needs-triage
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
strongswan
suse enterprise desktop 15 SP7
5.9.14-150700.3.21.2
fixed
suse enterprise sap 15 SP4
5.9.11-150400.19.40.2
fixed
suse enterprise sap 15 SP7
5.9.14-150700.3.21.2
fixed
suse enterprise server 15 SP4
5.9.11-150400.19.40.2
fixed
suse enterprise server 15 SP7
5.9.14-150700.3.21.2
fixed
strongswan-doc
suse enterprise desktop 15 SP7
5.9.14-150700.3.21.2
fixed
suse enterprise sap 15 SP4
5.9.11-150400.19.40.2
fixed
suse enterprise sap 15 SP7
5.9.14-150700.3.21.2
fixed
suse enterprise server 15 SP4
5.9.11-150400.19.40.2
fixed
suse enterprise server 15 SP7
5.9.14-150700.3.21.2
fixed
strongswan-hmac
suse enterprise desktop 15 SP7
5.9.14-150700.3.21.2
fixed
suse enterprise sap 15 SP4
5.9.11-150400.19.40.2
fixed
suse enterprise sap 15 SP7
5.9.14-150700.3.21.2
fixed
suse enterprise server 15 SP4
5.9.11-150400.19.40.2
fixed
suse enterprise server 15 SP7
5.9.14-150700.3.21.2
fixed
strongswan-ipsec
suse enterprise desktop 15 SP7
5.9.14-150700.3.21.2
fixed
suse enterprise sap 15 SP4
5.9.11-150400.19.40.2
fixed
suse enterprise sap 15 SP7
5.9.14-150700.3.21.2
fixed
suse enterprise server 15 SP4
5.9.11-150400.19.40.2
fixed
suse enterprise server 15 SP7
5.9.14-150700.3.21.2
fixed
strongswan-libs0
suse enterprise desktop 15 SP7
5.9.14-150700.3.21.2
fixed
suse enterprise sap 15 SP4
5.9.11-150400.19.40.2
fixed
suse enterprise sap 15 SP7
5.9.14-150700.3.21.2
fixed
suse enterprise server 15 SP4
5.9.11-150400.19.40.2
fixed
suse enterprise server 15 SP7
5.9.14-150700.3.21.2
fixed
Azure Linux logo
Azure Linux Releases
Azure Package
Release
strongswan
Azure Linux 3.0
0:5.9.14-11.azl3
fixed
Common Weakness Enumeration
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