Resource exhaustion in Faye Websocket-Driver
CVE-2026-54465
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.
EPSS: 0.003 (27.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Faye Websocket-driver
- Faye Websocket-driver-ruby — versions < 0.8.1
Weakness classification (CWE)
References
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-54465?
- CVE-2026-54465 is a high-severity vulnerability in Faye Websocket-Driver, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-07-17.
- How severe is CVE-2026-54465?
- High severity. CVSS v3 base score is 7.5 out of 10.