CVE-2026-78135

high

libcharon in strongSwan 5.9.7 through 6.0.7 mishandles behavioral workflow in the IKEv2 state machine.

Vendor / product: Strongswan — strongswan

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.

CVSS

7.3

7.3 (CVSS v3.1)

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

Severity source: NVD CVSS v3.1 (nvd@nist.gov)

Timeline (UTC)

Published: 2026-09-11 03:16

Modified: 2026-09-16 19:37

NVD status: Analyzed

Last synced 2 days ago

Verified against the source API 2026-10-27 06:52 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

strongswan / strongswan ≥5.9.7 ≤6.0.7

Weakness classification (CWE)

CWE-841

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://github.com/strongswan/strongswan/releases/tag/6.1.0

Vendor advisory: https://www.strongswan.org/blog/2026/09/07/strongswan-vulnerability-(cve-2026-78135).html

Patch / mitigation: https://www.strongswan.org/blog/2026/09/07/strongswan-vulnerability-(cve-2026-78135).html

References

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

Data sources

NVD CVE API 2.0 — fetched 2026-10-27 06:52 UTC · record ↗

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CVE-2026-78135

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