CVE-2026-78133

The ASN.1 parser in strongSwan before version 5.5.3 improperly handles CHOICE types when the x509 plugin is enabled, allowing remote attackers to cause a denial of service (infinite loop) via a crafted certificate.

strongSwan versions 5.2.2 and 5.3.0 allow remote attackers to cause a denial of service (daemon crash) or execute arbitrary code.

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.

strongSwan 4.5.0 through 6.0.7 has incorrect access control in the eap-ttls and eap-peap plugins because the inner EAP identity may be missing or mismatched.

strongSwan 5.1.3 through 6.0.7 has an infinite loop in the x509 plugin's attribute certificate parser for ietfAttrSyntax.

strongSwan 4.2.0 through 6.0.7 has a missing release of memory after its effective lifetime in the x509 plugin's attribute certificate parser.

strongSwan 4.2.0 through 6.0.7 has a NULL pointer dereference in the x509 plugin's attribute certificate parser.

strongSwan 4.6.2 through 6.0.7 has an infinite loop in PKCS#5 decryption.

libcharon in strongSwan 4.1.2 through 6.0.7 has a missing release of memory after its effective lifetime in the IKE message parser.

strongSwan 4.1.10 through 6.0.7 allows a NULL pointer dereference in the eap-aka plugin.