Missing Authorization Affecting lxd package, versions *


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.42% (35th percentile)

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  • Snyk IDSNYK-UBUNTU1804-LXD-16800652
  • 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?

There is no fixed version for Ubuntu:18.04 lxd.

NVD Description

Note: Versions mentioned in the description apply only to the upstream lxd package and not the lxd package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 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