Missing Authorization Affecting google-guest-agent package, versions <20250506.01-0ubuntu1.2


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.42% (35th percentile)

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  • Snyk IDSNYK-UBUNTU2510-GOOGLEGUESTAGENT-16800613
  • 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:25.10 google-guest-agent to version 20250506.01-0ubuntu1.2 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:25.10 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