CVE-2026-78135CWE-841

CVE-2026-78135

Medium · published September 11, 2026

CVSS v3.1
5.6
EPSS
0%
Percentile
35.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.6 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00424 · 35.6th percentile
Weakness
CWE-841 · Improper Enforcement of Behavioral Workflow
Published
2026-09-11T07:16Z
Affected products (1)
ProductVersionsFixed in
strongswan/strongswan≥ 5.9.7, ≤ 6.0.7—
References (2)
https://www.strongswan.org/blog/2026/09/07/strongswan-vulnerability-(cve-2026-78135).html · [email protected]https://github.com/strongswan/strongswan/releases/tag/6.1.0 · [email protected]
EPSS history
Timeline
  • 12 SEP 03:22Z
    EPSS moved — → 0%
    epss
  • 11 SEP 02:07Z
    libcharon in strongSwan 5.9.7 through 6.0.7 mishandles behavioral workflow in the IKEv2 state machine
    cvelistv5