{"schemaVersion":3,"id":"CVE-2026-77207","aliases":["DEBIAN-CVE-2026-77207"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-10-13T21:28:19.219Z","modified":"2026-10-16T15:31:53.986Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true}]},"epss":{"probability":0.00339,"percentile":0.25882,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-14T00:00:00.000Z","score":0.00339,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00339,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00339,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00339,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00339,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00339,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00339,"percentile":0.25882}],"last30":[{"date":"2026-10-14T00:00:00.000Z","score":0.00339,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00339,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00339,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00339,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00339,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00339,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00339,"percentile":0.25882}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-252","name":"Unchecked Return Value","description":"The product does not check the return value from a method or function, which can prevent it from detecting unexpected states and conditions.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"Low","url":"https://cwe.mitre.org/data/definitions/252.html"},{"id":"CWE-476","name":"NULL Pointer Dereference","description":"The product dereferences a pointer that it expects to be valid but is NULL.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/476.html"}],"affected":[{"vendor":"debian","product":"libreswan","name":"libreswan","label":"libreswan","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/libreswan","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"the libreswan project","product":"libreswan","name":"libreswan","label":"libreswan","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.7, ≤ 5.3.2","noFixRecorded":false,"fixedIn":null},{"text":"5.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.7, ≤ 5.3.2 | 5.4","eol":null,"hubHref":"/vendor/the_libreswan_project/libreswan"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://libreswan.org/security/CVE-2026-77207/CVE-2026-77207.txt","label":"libreswan.org/security/CVE-2026-77207/CVE-2026-77207.txt","hostname":"libreswan.org","tags":["Vendor Advisory"]},{"url":"https://libreswan.org/security/CVE-2026-77207/","label":"libreswan.org/security/CVE-2026-77207/","hostname":"libreswan.org","tags":["Patch"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-77207","label":"security-tracker.debian.org/tracker/CVE-2026-77207","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-13T21:28:19.219Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-16T15:31:53.986Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T14:39:44.331Z","stale":false,"partial":false}}