High 7.5Published Oct 13, 2026

CVE-2026-77207Null Pointer Dereference in PKCS#7 bundle with no certificates

Updated under an hour ago (2026-10-19 08:00 UTC)

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It affects The Libreswan Project libreswan. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.34%, higher than 26% of scored CVEs.

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Every CVE for The Libreswan Project libreswan

Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-476, CWE-252
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.34% (percentile 26)
Assigned by: libreswan
NVD analysis: Awaiting Analysis
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 13, 2026

Affected products

Affected products

The Libreswan Project libreswan libreswan_project:libreswan (from the name)	from 4.7 through 5.3.2; from 5.4 through 5.4; 5.3.3 not affected; 5.4.1 not affected	CNA record

References

https://libreswan.org/security/CVE-2026-77207/CVE-2026-77207.txtvendor-advisory
https://libreswan.org/security/CVE-2026-77207/patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.