CVE-2026-77207

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://libreswan.org/security/CVE-2026-77207/
https://libreswan.org/security/CVE-2026-77207/CVE-2026-77207.txt

Configurations

No configuration.

History

13 Oct 2026, 22:18

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-13 22:18

Updated : 2026-10-16 19:55

NVD link : CVE-2026-77207

Mitre link : CVE-2026-77207

CVE.ORG link : CVE-2026-77207

JSON object : View

Products Affected

No product.

CWE

CWE-252

Unchecked Return Value

CWE-476

NULL Pointer Dereference

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