Use After Free in Strongswan

CVE-2026-78133

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

Vulnerability class: Use-After-Free

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Strongswan

Weakness classification (CWE)

CWE-416 — Use After Free

References

Frequently asked questions

What is CVE-2026-78133?: CVE-2026-78133 is a high-severity vulnerability in Strongswan, classified under Use After Free. CVSS score: 7.5/10. Published 2026-09-11.
How severe is CVE-2026-78133?: High severity. CVSS v3 base score is 7.5 out of 10.