CVE-2021-34422: Keybase

Critical severity, CVSS 9.0. EPSS: 1.4% chance of exploitation in the next 30 days.

The Keybase Client for Windows before version 5.7.0 contains a path traversal vulnerability when checking the name of a file uploaded to a team folder. A malicious user could upload a file to a shared folder with a specially crafted file name which could allow a user to execute an application which was not intended on their host machine. If a malicious user leveraged this issue with the public folder sharing feature of the Keybase client, this could lead to remote code execution.

Affected products

• Keybase Keybase: before 5.7.0 (fixed in 5.7.0)

Published 2021-11-11. Last modified 2026-06-17.