Missing Authorization Affecting google-guest-agent package, versions <20250116.00-0ubuntu1~20.04.0+esm3


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.42% (35th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-UBUNTU2004-GOOGLEGUESTAGENT-16800649
  • published17 Jun 2026
  • disclosed22 May 2026

Introduced: 22 May 2026

CVE-2026-39831  (opens in a new tab)
CWE-862  (opens in a new tab)

How to fix?

Upgrade Ubuntu:20.04 google-guest-agent to version 20250116.00-0ubuntu1~20.04.0+esm3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream google-guest-agent package and not the google-guest-agent package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

The Verify() method for FIDO/U2F security key types (sk-ecdsa-sha2-nistp256@openssh.com, sk-ssh-ed25519@openssh.com) did not check the User Presence flag. Signatures generated without physical touch were accepted, allowing unattended use of a hardware security key. To restore the previous behavior, return a "no-touch-required" extension in Permissions.Extensions from PublicKeyCallback.

CVSS Base Scores

version 3.1