CVE-2026-78135

7.3 highEPSS 0.4%

High (7.3) in strongswan strongswan. EPSS 0.4% chance of exploitation in the next 30 days.

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

CVSS 3.1

7.3 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 36% of CVEs (scores of 2026-10-31)
CWE: CWE-841
Published: 2026-09-11
Modified: 2026-09-16
Record from: the NVD, synced 2026-10-19

Affected

strongswan:strongswan

References

https://github.com/strongswan/strongswan/releases/tag/6.1.0
https://www.strongswan.org/blog/2026/09/07/strongswan-vulnerability-(cve-2026-78135).html

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