{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-77207",
        "assignerOrgId": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
        "state": "PUBLISHED",
        "assignerShortName": "libreswan",
        "dateReserved": "2026-08-20T18:13:09.377Z",
        "datePublished": "2026-10-13T21:28:19.219Z",
        "dateUpdated": "2026-10-13T21:28:19.219Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "d42dc95b-23f1-4e06-9076-20753a0fb0df",
                "shortName": "libreswan",
                "dateUpdated": "2026-10-13T21:28:19.219Z"
            },
            "title": "Null Pointer Dereference in PKCS#7 bundle with no certificates",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "affected": [
                {
                    "vendor": "The Libreswan Project",
                    "product": "libreswan",
                    "packageName": "libreswan",
                    "collectionURL": "https://github.com/libreswan/libreswan",
                    "repo": "https://github.com/libreswan/libreswan",
                    "versions": [
                        {
                            "version": "4.7",
                            "status": "affected",
                            "lessThanOrEqual": "5.3.2",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.4",
                            "status": "affected",
                            "lessThanOrEqual": "5.4",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.3.3",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.4.1",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected",
                    "programRoutines": [
                        {
                            "name": "decode_cert_payloads"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "type": "CWE",
                            "cweId": "CWE-476",
                            "description": "CWE-476: Null Pointer Dereference"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "type": "CWE",
                            "cweId": "CWE-252",
                            "description": "CWE-252: Unchecked Return Value"
                        }
                    ]
                }
            ],
            "impacts": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "Denial of service via null pointer dereference in PKCS#7 certificate handling when processing malicious IKE_AUTH packets"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ],
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "HIGH"
                    }
                },
                {
                    "other": {
                        "type": "vendorSeverity",
                        "content": {
                            "value": "MEDIUM",
                            "description": "Vendor-assessed severity: Medium. Exploitation does not require authentication, but the daemon automatically restarts after the crash, requiring continued exploitation for sustained denial of service."
                        }
                    }
                }
            ],
            "workarounds": [
                {
                    "lang": "en",
                    "value": "Apply the available patch or upgrade to a supported version. No configuration-based workaround is available."
                }
            ],
            "solutions": [
                {
                    "lang": "en",
                    "value": "Upgrade to libreswan 5.3.3 or 5.4.1 or later. Patches are available at https://libreswan.org/security/CVE-2026-77207/"
                }
            ],
            "exploits": [
                {
                    "lang": "en",
                    "value": "No known exploitation in the wild. Exploitation requires sending a malicious IKE CERT payload with a PKCS#7 SignedData containing a CRL but no certificates, and does not require peer authentication."
                }
            ],
            "configurations": [
                {
                    "lang": "en",
                    "value": "Any server or client that accepts IKEv2 connections with certificate-based authentication is vulnerable."
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "tool",
                    "value": "Claude (Anthropic)"
                },
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "David Korczynski (ADA Logics Ltd)"
                }
            ],
            "source": {
                "discovery": "EXTERNAL",
                "defects": [
                    "CVE-2026-77207"
                ]
            },
            "references": [
                {
                    "name": "Libreswan Security Advisory CVE-2026-77207",
                    "url": "https://libreswan.org/security/CVE-2026-77207/CVE-2026-77207.txt",
                    "tags": [
                        "vendor-advisory"
                    ]
                },
                {
                    "name": "Libreswan CVE-2026-77207 Patches",
                    "url": "https://libreswan.org/security/CVE-2026-77207/",
                    "tags": [
                        "patch"
                    ]
                }
            ],
            "timeline": [
                {
                    "time": "2026-08-05T00:00:00.000Z",
                    "lang": "en",
                    "value": "Libreswan was notified of the issue via security@libreswan.org"
                },
                {
                    "time": "2026-09-24T00:00:00.000Z",
                    "lang": "en",
                    "value": "Advanced notice given to supported customers and distributions"
                },
                {
                    "time": "2026-10-05T00:00:00.000Z",
                    "lang": "en",
                    "value": "Public announcement and release of libreswan 5.3.3 and 5.4.1"
                }
            ],
            "taxonomyMappings": [
                {
                    "taxonomyName": "ATT&CK",
                    "taxonomyVersion": "15.1",
                    "taxonomyRelations": [
                        {
                            "taxonomyId": "T1499.004",
                            "relationshipName": "maps to",
                            "relationshipValue": "Application or System Exploitation (DoS)"
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                }
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            "x_generator": {
                "engine": "cvelib 1.8.0"
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    }
}