---
cve: "CVE-2026-69204"
severity: "CRITICAL"
cvss: 9.2
epss: "0.3%"
vendor: "http4s"
kev: false
exploited: false
published: "2026-09-15 19:17:37"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-24T16:16:37+02:00"
---

# CVE-2026-69204

> 9.2 CRITICAL · 🧪 PoC

## Beschreibung

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember HTTP/1.1 does not reject messages containing both Transfer-Encoding and Content-Length, so an intermediary and Ember can select different body framing rules. When ember-server is behind a keep-alive intermediary that forwards both headers and frames by Content-Length, an unauthenticated attacker can smuggle a second request, bypass intermediary access controls, poison caches, or cause a victim request to be joined to an attacker-controlled prefix. The shared response parser can also desynchronize an ember-client connection when a malicious or compromised upstream sends both headers. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- a83f5f4f7e14c5b4d4a91dd71b105cbbbb391298 (Commit)
- 6083780a3009bd7b26033b0ceb3d32c658b0377e (Commit)

## Referenzen

- <https://github.com/http4s/http4s/security/advisories/GHSA-8h4c-x2wg-6xp8>
- <https://github.com/http4s/http4s/commit/9feaf8677951a52af906ae9664ff6f0543d9d810>
- <https://github.com/http4s/http4s/releases/tag/v0.23.35>
- <https://github.com/http4s/http4s/releases/tag/v1.0.0-M47>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-69204) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_