CVE-2026-77207

Null Pointer Dereference in PKCS#7 bundle with no certificates

State: Published
Severity: 7.5 High
Published: Oct 13, 2026
Updated: Oct 16, 2026
Reserved: Aug 20, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	libreswan

Weaknesses

CWE-476 Null Pointer Dereference
CWE-252 Unchecked Return Value

Affected Products

Product	Versions
libreswanThe Libreswan Project	4.7 through 5.3.2Affected 5.4 through 5.4Affected 5.3.3Not affected 5.4.1Not affected

References

Libreswan Security Advisory CVE-2026-77207vendor-advisory
Libreswan CVE-2026-77207 Patchespatch

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