---
cve: "CVE-2026-69202"
severity: "HIGH"
cvss: 7.5
epss: "0.4%"
vendor: "http4s"
kev: false
exploited: false
published: "2026-09-15 20:17:38"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-24T23:59:57+02:00"
---

# CVE-2026-69202

> 7.5 HIGH · 🧪 PoC

## Beschreibung

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HTTP/2 flow-control window is replenished according to bytes received from the network rather than bytes consumed by the application, while each stream stores DATA in an unbounded channel. A hostile peer can therefore send a body faster than a slow or non-draining application consumes it, retaining payloads in heap on an ember-server or ember-client configured with withHttp2. The patch bounds the per-stream H2Connection body channel so application consumption applies backpressure. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

## CVSS-Vektor

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

| 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 | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- a83f5f4f7e14c5b4d4a91dd71b105cbbbb391298 (Commit)
- 6083780a3009bd7b26033b0ceb3d32c658b0377e (Commit)

## Referenzen

- <https://github.com/http4s/http4s/security/advisories/GHSA-6m4x-pp6q-5jmm>
- <https://github.com/http4s/http4s/commit/22d2335975d02dc9fb9fb75cfe002279521d86ac>
- <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-2026-69202) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_