CVE-2026-77207

Libreswan is an implementation of IPsec and IKE for Linux. IPsec is the Internet Protocol Security and uses strong cryptography to provide both authentication and encryption services. These services allow you to build secure tunnels through untrusted networks such as virtual private network (VPN).

Security Fix(es):

• libreswan: IKEv2 Use-After-Free bug when using IKE-over-TCP (CVE-2026-94453)

• libreswan: IKEv2 pre-authentication Null Pointer deref in EAP code (CVE-2026-77206)

• libreswan: Null Pointer Dereference in PKCS#7 bundle with no CERTS (CVE-2026-77207)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Libreswan is an implementation of IPsec and IKE for Linux. IPsec is the Internet Protocol Security and uses strong cryptography to provide both authentication and encryption services. These services allow you to build secure tunnels through untrusted networks such as virtual private network (VPN).

Security Fix(es):

• libreswan: IKEv2 Use-After-Free bug when using IKE-over-TCP (CVE-2026-94453)

• libreswan: Denial of Service via sending bogus X.509 certificates (CVE-2026-77205)

• libreswan: Null Pointer Dereference in PKCS#7 bundle with no CERTS (CVE-2026-77207)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Libreswan is an implementation of IPsec and IKE for Linux. IPsec is the Internet Protocol Security and uses strong cryptography to provide both authentication and encryption services. These services allow you to build secure tunnels through untrusted networks such as virtual private network (VPN).

Security Fix(es):

• libreswan: IKEv2 Use-After-Free bug when using IKE-over-TCP (CVE-2026-94453)

• libreswan: IKEv2 pre-authentication Null Pointer deref in EAP code (CVE-2026-77206)

• libreswan: Null Pointer Dereference in PKCS#7 bundle with no CERTS (CVE-2026-77207)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Libreswan is an implementation of IPsec and IKE for Linux. IPsec is the Internet Protocol Security and uses strong cryptography to provide both authentication and encryption services. These services allow you to build secure tunnels through untrusted networks such as virtual private network (VPN).

Security Fix(es):

• libreswan: IKEv2 Use-After-Free bug when using IKE-over-TCP (CVE-2026-94453)
• libreswan: IKEv2 pre-authentication Null Pointer deref in EAP code (CVE-2026-77206)
• libreswan: Null Pointer Dereference in PKCS#7 bundle with no CERTS (CVE-2026-77207)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Libreswan is an implementation of IPsec and IKE for Linux. IPsec is the Internet Protocol Security and uses strong cryptography to provide both authentication and encryption services. These services allow you to build secure tunnels through untrusted networks such as virtual private network (VPN).

Security Fix(es):

• libreswan: IKEv2 Use-After-Free bug when using IKE-over-TCP (CVE-2026-94453)
• libreswan: Denial of Service via sending bogus X.509 certificates (CVE-2026-77205)
• libreswan: Null Pointer Dereference in PKCS#7 bundle with no CERTS (CVE-2026-77207)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Libreswan is an implementation of IPsec and IKE for Linux. IPsec is the Internet Protocol Security and uses strong cryptography to provide both authentication and encryption services. These services allow you to build secure tunnels through untrusted networks such as virtual private network (VPN).

Security Fix(es):

• libreswan: IKEv2 Use-After-Free bug when using IKE-over-TCP (CVE-2026-94453)
• libreswan: IKEv2 pre-authentication Null Pointer deref in EAP code (CVE-2026-77206)
• libreswan: Null Pointer Dereference in PKCS#7 bundle with no CERTS (CVE-2026-77207)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Libreswan has a null pointer dereference bug in the PKCS#7 handling code for IKE certificate authentication. When libreswan decodes an IKE CERT payload of type CERT_PKCS7_WRAPPED_X509, it guards the PKCS#7 blob with SEC_PKCS7ContainsCertsOrCrls() and then iterates the certificate list with SEC_PKCS7GetCertificateList(). The two NSS APIs disagree on a SignedData that carries a CRL but no certificates: ContainsCertsOrCrls() returns PR_TRUE (there is a CRL), so the guard passes, but GetCertificateList() returns NULL (there are no certificates). This causes libreswan to dereference a null pointer leading to a crash and restart. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. No remote code execution is possible. Continued exploitation can cause a denial of service.

• CVE-2026-77207: fix a pre-auth NULL pointer dereference in decode_cert_payloads() when a PKCS#7 wrapped CERT payload carries no certificate list (CRL-only or non-SignedData content)