{"id":"CVE-2026-78135","title":"libcharon in strongSwan 5.9.7 through 6.0.7 mishandles behavioral workflow in the IKEv2 state machine","summary":"libcharon in strongSwan 5.9.7 through 6.0.7 mishandles behavioral workflow in the IKEv2 state machine. Because CREATE_CHILD_SA requests are mishandled, there can be an authentication bypass.","severity":"medium","cvss":5.6,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","cwe":["CWE-841"],"vendor":"strongswan","product":"strongswan","affected":["strongswan >= 5.9.7, <= 6.0.7"],"published":"2026-09-11","updated":"2026-09-16","sourceUpdated":"2026-09-16T19:37:30.467","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-78135","references":[{"url":"https://github.com/strongswan/strongswan/releases/tag/6.1.0","label":"cve@mitre.org"},{"url":"https://www.strongswan.org/blog/2026/09/07/strongswan-vulnerability-(cve-2026-78135).html","label":"cve@mitre.org"}],"tags":["nvd","cve.org"],"epss":0.00363,"epssPercentile":0.30023,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-15T15:32:40.015957Z"},"ingestedAt":"2026-09-12T18:50:07.998Z","slug":"CVE-2026-78135","body":"## Overview\n\nlibcharon in strongSwan 5.9.7 through 6.0.7 mishandles behavioral workflow in the IKEv2 state machine. Because CREATE_CHILD_SA requests are mishandled, there can be an authentication bypass.\n\n## Affected\n\n- `strongswan >= 5.9.7, <= 6.0.7`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":31,"depthScoreParts":{"impact":30.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}