---
cve: "CVE-2026-54466"
severity: "CRITICAL"
cvss: 9.2
epss: "22%"
vendor: "faye"
kev: false
exploited: false
published: "2026-07-17 21:17:08"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T00:02:18+02:00"
---

# CVE-2026-54466

> 9.2 CRITICAL · 🧪 PoC

## Beschreibung

websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.7.5, the frame format in draft versions of the WebSocket protocol includes a length header that allows an arbitrarily large integer to be encoded as a sequence of bytes with the high bit set. By sending an indefinite sequence of bytes with values 0x80 or above, a client can make the server parse these bytes into an ever-growing integer in lib/websocket/driver/draft75.js; because JavaScript numbers are 64-bit floating point values, this number will eventually lose precision and lead to the subsequent payload being parsed incorrectly. This issue is fixed in version 0.7.5.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 5b197ca874dab58e96cacad8a3c256797d804680 (Commit)
- 911d14b96ae604bb0d22ef584cff5af578e6702f (Commit)

## Referenzen

- <https://github.com/faye/websocket-driver-node/security/advisories/GHSA-xv26-6w52-cph6>
- <https://github.com/faye/websocket-driver-node/commit/5b197ca874dab58e96cacad8a3c256797d804680>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-54466) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_