---
cve: "CVE-2026-59725"
severity: "HIGH"
cvss: 7.5
epss: "0.6%"
vendor: "socketio"
kev: false
exploited: false
published: "2026-07-08 15:37:52"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T18:27:14+02:00"
---

# CVE-2026-59725

> 7.5 HIGH · 🧪 PoC

## Beschreibung

Socket.IO enables bidirectional and low-latency communication for every platform. From 4.1.0 before 6.6.7, Engine.IO protocol v4 polling transport does not properly close the HTTP response for invalid binary POST requests with Content-Type: application/octet-stream, allowing an unauthenticated attacker to exhaust server-side connections and sockets. This issue is fixed in version 6.6.7.

## 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)

- 439a8f669c6788b512dd76011c4476830d67515b (Commit)
- fc11285e14964c2132d122164bf130c355f60671 (Commit)

## Referenzen

- <https://github.com/socketio/socket.io/security/advisories/GHSA-r635-g3xr-vw7x>
- <https://github.com/socketio/socket.io/commit/fc11285e14964c2132d122164bf130c355f60671>
- <https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.7>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-59725) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_