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Date: Mon, 4 Oct 2021 18:57:19 +0000
From: "Karp, Samuel" <>
To: "" <>
Subject: Moby (Docker Engine) CVE-2021-41089

A bug was found in Moby (Docker Engine) where attempting to copy files
using docker cp into a specially-crafted container can result in Unix
file permission changes for existing files in the host's filesystem,
widening access to others. This bug does not directly allow files to be
read, modified, or executed without an additional cooperating process.

This bug has been fixed in Moby (Docker Engine) 20.10.9. Users should
update to this version as soon as possible. Running containers do not
need to be restarted.

Ensure you only run trusted containers.

The Moby project would like to thank Lei Wang and Ruizhi Xiao for
responsibly disclosing this issue in accordance with the Moby security

If you have any questions or comments about this advisory:
Open an issue [1]
Email us at  if you think you’ve found a
security bug

View this advisory on the web:

On behalf of the Moby project,
Samuel Karp


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