---
cve: "CVE-2026-70188"
severity: "CRITICAL"
cvss: 9.1
epss: "0.9%"
vendor: "Microsoft"
kev: false
exploited: false
published: "2026-10-13 19:19:33"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-29T08:29:54+01:00"
---

# CVE-2026-70188

> 9.1 CRITICAL

## Beschreibung

Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network.

## CNA-Record (Kanon, cvelistV5)

- CNA: **microsoft**
- State: PUBLISHED
- Stand: 2026-10-28 18:15:10
- CNA-CVSS: **9.1** (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **total**

## CVSS-Vektor

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

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

## Schwachstellen-Klasse

- **CWE-444** — Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
  The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

## Angriffsmuster (CAPEC)

- [CAPEC-33 — HTTP Request Smuggling](https://capec.mitre.org/data/definitions/33.html) _(Severity: High)_
- [CAPEC-273 — HTTP Response Smuggling](https://capec.mitre.org/data/definitions/273.html) _(Severity: High)_

## BSI-Hinweise (deutsch)

- [Microsoft Entwicklerwerkzeuge: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-3893) — _BSI-Einstufung: hoch_
  Ein Angreifer kann mehrere Schwachstellen in Microsoft .NET Framework, Microsoft .NET, Microsoft ASP.NET, Microsoft Visual Studio 2022, Microsoft Visual Studio 2026, Microsoft Visual Studio Code, Microsoft SysInternals und Microsoft PowerShell ausnutzen, um seine Privilegien zu erhöhen, um Code auszuführen, um Informationen offenzulegen, um Sicherheitsmechanismen zu umgehen und um einen Denial of Service Zustand herbeizuführen.

## Referenzen

- <https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70188>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-70188/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_