---
cve: "CVE-2026-69217"
severity: "HIGH"
cvss: 8.7
epss: "0.5%"
vendor: "http4s"
kev: false
exploited: false
published: "2026-09-15 20:17:41"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-26T10:57:04+02:00"
---

# CVE-2026-69217

> 8.7 HIGH · 🧪 PoC

## Beschreibung

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HTTP/1.1 parser accepts differing duplicate Content-Length headers and uses the last value instead of rejecting the message. When an Ember server is behind a keep-alive intermediary that selects a different occurrence, an unauthenticated attacker can create CL.CL request smuggling that bypasses front-end controls, captures a later user’s headers, or poisons a cache. The shared client parser can also misframe responses from a malicious or compromised upstream when the client acts as a proxy for multiple downstream consumers. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- a83f5f4f7e14c5b4d4a91dd71b105cbbbb391298 (Commit)
- 6083780a3009bd7b26033b0ceb3d32c658b0377e (Commit)

## Referenzen

- <https://github.com/http4s/http4s/security/advisories/GHSA-p83c-4wj9-p6w9>
- <https://github.com/http4s/http4s/commit/24e8d34e3ea89f8f23e0053ec9944f6467e8086d>
- <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-2026-69217) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_