{"id":"CVE-2026-77207","title":"Libreswan has a null pointer dereference bug in the PKCS#7 handling code for IKE certificate authentication","summary":"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_PKCS7ContainsCert…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-252","CWE-476"],"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["fast_datapath_for_rhel 9","enterprise_linux 10","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"patched":["enterprise_linux_appstream_v_9"],"published":"2026-10-13","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:55:59.740","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77207","references":[{"url":"https://libreswan.org/security/CVE-2026-77207/","label":"d42dc95b-23f1-4e06-9076-20753a0fb0df"},{"url":"https://libreswan.org/security/CVE-2026-77207/CVE-2026-77207.txt","label":"d42dc95b-23f1-4e06-9076-20753a0fb0df"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77207.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-77207"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2550258"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-77207"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77207"},{"url":"https://libreswan.org/security/CVE-2026-77207/libreswan-5.3-CVE-2026-77207.patch"},{"url":"https://libreswan.org/security/CVE-2026-77207/libreswan-5.4-CVE-2026-77207.patch"},{"url":"https://access.redhat.com/errata/RHSA-2026:89748"}],"tags":["nvd","csaf","vex","red-hat","cve.org"],"epss":0.00463,"epssPercentile":0.39929,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-16T15:14:50.209248Z"},"ingestedAt":"2026-10-13T23:03:54.749Z","slug":"CVE-2026-77207","body":"## Overview\n\nLibreswan 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Fast Datapath for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat OpenShift Container Platform 4 · no fix planned: Fast Datapath for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat OpenShift Container Platform 4 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77207.json)\n- **RHSA-2026:89748** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-10-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:89748)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}