---
cve: "CVE-2026-78135"
severity: "MEDIUM"
cvss: 5.6
epss: "0.4%"
vendor: "strongSwan"
kev: false
exploited: false
published: "2026-09-11 03:16:23"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T21:46:34+02:00"
---

# CVE-2026-78135

> 5.6 MEDIUM · 🧪 PoC

## Beschreibung

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-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- b43f6bfeed34b4afc8a7eb0c0de38e6e70177847 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-78135) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_