Vulnerability · Published Jul 17, 2026 · Assigned by GitHub_M
CVE-2026-54466websocket-driver: Message corruption via abuse of protocol length headers
Critical 9.2
In plain English
A critical-severity security flaw in websocket-driver-node from faye. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | node-websocket-driver | no fix listed | DEBIAN-CVE-2026-54466 |
| Debian:13 | node-websocket-driver | no fix listed | DEBIAN-CVE-2026-54466 |
| Debian:14 | node-websocket-driver | 0.7.5+~cs0.6.14-1 | DEBIAN-CVE-2026-54466 |
| Ubuntu:22.04:LTS | node-websocket-driver | no fix listed | UBUNTU-CVE-2026-54466 |
| Ubuntu:24.04:LTS | node-websocket-driver | no fix listed | UBUNTU-CVE-2026-54466 |
| Ubuntu:26.04:LTS | node-websocket-driver | no fix listed | UBUNTU-CVE-2026-54466 |
| Ubuntu:26.10 | node-websocket-driver | no fix listed | UBUNTU-CVE-2026-54466 |
| npm | websocket-driver | 0.7.5 | GHSA-xv26-6w52-cph6 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| faye | websocket-driver-node | < 0.7.5 |
Weakness: CWE-130 · Vector: 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