packages:
  - module: github.com/gorilla/websocket
    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
    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
links:
    pr: https://github.com/gorilla/websocket/pull/537
    commit: https://github.com/gorilla/websocket/commit/5b740c29263eb386f33f265561c8262522f19d37