CVE-2026-78133: Strongswan

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision handling.

Affected products

• Strongswan Strongswan: from 6.0.0, before 6.1.0 (fixed in 6.1.0)

Published 2026-09-11. Last modified 2026-09-14.