{"schemaVersion":3,"id":"CVE-2026-94453","aliases":["DEBIAN-CVE-2026-94453","UBUNTU-CVE-2026-94453"],"status":"published","duplicateOf":null,"title":null,"description":"Libreswan's pluto daemon has a use-after-free vulnerability when a client connecting using IKE over TCP closes the connection and another packet (retransmit or malicious) is received for the same tuple. IKE state is retained in memory after the client closes the connection, storing a pointer to iface_endpoint inside ike_sa.sa->st_iface_endpoint. Once this invalid pointer is used, the daemon crashes and restarts. This vulnerability can be triggered before the remote peer has authenticated itself. Continued exploitation can lead to a denial of service. Remote code execution could be possible. The IKE over TCP option is not enabled by default; only configurations that contain listen-tcp=yes are affected.","dates":{"published":"2026-10-13T21:27:43.376Z","modified":"2026-10-16T15:31:54.755Z","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},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","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":0.00454,"percentile":0.38102,"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":0.00454,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00454,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00454,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00454,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00454,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00454,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00454,"percentile":0.38102}],"last30":[{"date":"2026-10-14T00:00:00.000Z","score":0.00454,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00454,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00454,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00454,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00454,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00454,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00454,"percentile":0.38102}]},"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-416","name":"Use After Free","description":"The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory \"belongs\" to the code that operates on the new pointer.","type":"weakness","status":"Stable","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/416.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":"ubuntu","product":"libreswan","name":"libreswan","label":"libreswan","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/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":"≥ 4.0, ≤ 5.3.2","noFixRecorded":false,"fixedIn":null},{"text":"5.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.0, ≤ 5.3.2 | 5.4","eol":null,"hubHref":"/vendor/the_libreswan_project/libreswan"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://libreswan.org/security/CVE-2026-94453/CVE-2026-94453.txt","label":"libreswan.org/security/CVE-2026-94453/CVE-2026-94453.txt","hostname":"libreswan.org","tags":["Vendor Advisory","REPORT"]},{"url":"https://libreswan.org/security/CVE-2026-94453/","label":"libreswan.org/security/CVE-2026-94453/","hostname":"libreswan.org","tags":["Patch","REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-94453","label":"security-tracker.debian.org/tracker/CVE-2026-94453","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-94453","label":"ubuntu.com/security/CVE-2026-94453","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-94453","label":"www.cve.org/CVERecord?id=CVE-2026-94453","hostname":"www.cve.org","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-13T21:27:43.376Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-16T15:31:54.755Z","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":"2026-10-20T14:49:54.270Z","stale":false,"partial":false}}