module: github.com/gorilla/websocket
versions:
  - fixed: v1.4.1
description: |
  An attacker can craft malicious WebSocket frames that cause an integer
  overflow in a variable which tracks the number of bytes remaining. This
  may cause the server or client to get stuck attempting to read frames
  in a loop, which can be used as a denial of service vector.
published: 2021-04-14T12:00:00Z
cves:
  - CVE-2020-27813
credit: Max Justicz
symbols:
  - Conn.advanceFrame
  - messageReader.Read
links:
  pr: https://github.com/gorilla/websocket/pull/537
  commit: https://github.com/gorilla/websocket/commit/5b740c29263eb386f33f265561c8262522f19d37