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: 2021-04-14T20:04:52Z
cves:
  - CVE-2020-27813
ghsas:
  - GHSA-3xh2-74w9-5vxm
credit: Max Justicz
symbols:
  - Conn.advanceFrame
  - messageReader.Read
derived_symbols:
  - Conn.Close
  - Conn.NextReader
  - Conn.ReadJSON
  - Conn.ReadMessage
  - Conn.WriteJSON
  - Conn.WritePreparedMessage
  - Dialer.Dial
  - Dialer.DialContext
  - NewClient
  - NewPreparedMessage
  - ReadJSON
  - Subprotocols
  - Upgrade
  - Upgrader.Upgrade
  - WriteJSON
  - httpProxyDialer.Dial
  - netDialerFunc.Dial
  - proxy_direct.Dial
  - proxy_envOnce.Get
  - proxy_socks5.Dial
links:
    pr: https://github.com/gorilla/websocket/pull/537
    commit: https://github.com/gorilla/websocket/commit/5b740c29263eb386f33f265561c8262522f19d37