Vulnerability · Published Jul 17, 2026 · Assigned by GitHub_M
CVE-2026-54463websocket-driver: Memory exhaustion via abuse of protocol length headers
Medium 6.9
In plain English
A medium-severity resource allocation without limits in websocket-driver-ruby from faye. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% 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 0.8.1, draft versions of the WebSocket protocol in websocket-driver include a length header that allows an arbitrarily large integer to be encoded as bytes with the high bit set, and a server or client can send an indefinite sequence of 0x80 or higher bytes that the peer parses into an ever-growing Ruby integer. This can make a WebSocket connection consume an unbounded amount of memory and lead to the host process running out of memory. This issue is fixed in version 0.8.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ruby-websocket-driver | no fix listed | DEBIAN-CVE-2026-54463 |
| Debian:13 | ruby-websocket-driver | no fix listed | DEBIAN-CVE-2026-54463 |
| Debian:14 | ruby-websocket-driver | 0.8.1-1 | DEBIAN-CVE-2026-54463 |
| RubyGems | websocket-driver | 0.8.1 | GHSA-ghhp-3qvg-889p |
| Ubuntu:22.04:LTS | ruby-websocket-driver | no fix listed | UBUNTU-CVE-2026-54463 |
| Ubuntu:24.04:LTS | ruby-websocket-driver | no fix listed | UBUNTU-CVE-2026-54463 |
| Ubuntu:26.04:LTS | ruby-websocket-driver | no fix listed | UBUNTU-CVE-2026-54463 |
| Ubuntu:26.10 | ruby-websocket-driver | no fix listed | UBUNTU-CVE-2026-54463 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| faye | websocket-driver-ruby | < 0.8.1 |
Weakness: CWE-770 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L