Vulnerability · Published Jul 17, 2026 · Assigned by GitHub_M
CVE-2026-54465websocket-driver: Memory exhaustion in HTTP header parser
Medium 6.3
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, when websocket-driver is used to implement a WebSocket server on top of a TCP server using WebSocket::Driver.server() or to complement a WebSocket client, a peer can make a single connection consume an unbounded amount of memory by sending an HTTP request or response with a never-ending list of headers. This can lead to the receiving 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-2026-54465 |
| Debian:13 | ruby-websocket-driver | no fix listed | DEBIAN-CVE-2026-54465 |
| Debian:14 | ruby-websocket-driver | 0.8.1-1 | DEBIAN-CVE-2026-54465 |
| RubyGems | websocket-driver | 0.8.1 | GHSA-8j3g-f24p-4mpw |
| Ubuntu:22.04:LTS | ruby-websocket-driver | no fix listed | UBUNTU-CVE-2026-54465 |
| Ubuntu:24.04:LTS | ruby-websocket-driver | no fix listed | UBUNTU-CVE-2026-54465 |
| Ubuntu:26.04:LTS | ruby-websocket-driver | no fix listed | UBUNTU-CVE-2026-54465 |
| Ubuntu:26.10 | ruby-websocket-driver | no fix listed | UBUNTU-CVE-2026-54465 |
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:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L