diff --git a/meta-networking/recipes-support/strongswan/strongswan/CVE-2026-78126.patch b/meta-networking/recipes-support/strongswan/strongswan/CVE-2026-78126.patch
new file mode 100644
index 0000000000..9d4ce09d38
--- /dev/null
+++ b/meta-networking/recipes-support/strongswan/strongswan/CVE-2026-78126.patch
@@ -0,0 +1,37 @@
+From 13aa926cad7ec7f668249b6513c938b8c2e95af4 Mon Sep 17 00:00:00 2001
+From: Tobias Brunner <tobias@strongswan.org>
+Date: Thu, 4 Jun 2026 10:00:02 +0200
+Subject: [PATCH] eap-aka: Only accept AKA-Synchronization-Failure if expected
+
+This fixes a NULL-pointer dereference if the client sends such an error
+before the server issued a challenge and allocated this->rand.
+
+Fixes: 26e246769224 ("ported EAP-AKA branch into trunk")
+Fixes: 4735965fc048 ("EAP servers check if the received EAP message was expected")
+Fixes: CVE-2026-78126
+
+CVE: CVE-2026-78126
+Upstream-Status: Backport [https://github.com/strongiswan/strongswan/commit/7bedb451346261370256d390a8c155b86e4b455d]
+
+Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
+---
+ src/libcharon/plugins/eap_aka/eap_aka_server.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/src/libcharon/plugins/eap_aka/eap_aka_server.c b/src/libcharon/plugins/eap_aka/eap_aka_server.c
+index 0712ccc..95d4b03 100644
+--- a/src/libcharon/plugins/eap_aka/eap_aka_server.c
++++ b/src/libcharon/plugins/eap_aka/eap_aka_server.c
+@@ -505,6 +505,12 @@ static status_t process_synchronize(private_eap_aka_server_t *this,
+ 	simaka_attribute_t type;
+ 	chunk_t data, auts = chunk_empty;
+ 
++	if (this->pending != AKA_CHALLENGE)
++	{
++		DBG1(DBG_IKE, "received %N, but not expected",
++			 simaka_subtype_names, AKA_SYNCHRONIZATION_FAILURE);
++		return FAILED;
++	}
+ 	if (this->synchronized)
+ 	{
+ 		DBG1(DBG_IKE, "received %N, but peer did already resynchronize",
diff --git a/meta-networking/recipes-support/strongswan/strongswan_6.0.6.bb b/meta-networking/recipes-support/strongswan/strongswan_6.0.6.bb
index e7a5370f03..82dbd3367c 100644
--- a/meta-networking/recipes-support/strongswan/strongswan_6.0.6.bb
+++ b/meta-networking/recipes-support/strongswan/strongswan_6.0.6.bb
@@ -12,6 +12,7 @@ SRC_URI = "https://download.strongswan.org/strongswan-${PV}.tar.bz2 \
            file://CVE-2026-47895.patch \
            file://CVE-2026-78123.patch \
            file://CVE-2026-78124.patch \
+           file://CVE-2026-78126.patch \
 "
 
 SRC_URI[sha256sum] = "07df7cedae56a7f3bb07e66d21a1f9f87e961db70e99184e11d3819413e4f87c"