---
cve: "CVE-2026-111809"
severity: "MEDIUM"
cvss: 6.9
epss: "0.2%"
vendor: "Apache Software Foundation"
kev: false
exploited: false
published: "2026-10-21 20:17:22"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-11-02T09:00:03+01:00"
---

# CVE-2026-111809

> 6.9 MEDIUM

## Beschreibung

Apache Traffic Server allows request smuggling via HEAD requests that carry Content-Length or Transfer-Encoding.



This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0.



Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.

## CNA-Record (Kanon, cvelistV5)

- CNA: **apache**
- State: PUBLISHED
- Stand: 2026-10-28 01:34:23
- CNA-CVSS: **9.3** (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N`)

## CISA-Anreicherung (vulnrichment/ADP)

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

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:H/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Schwachstellen-Klasse

- **CWE-444** — Inconsistent Interpretation of HTTP Requests
  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)_

## Referenzen

- <https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-111809/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_