{"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)"}]}], "x_generator": {"engine": "cvelib 1.8.0"}}}}

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