Malicious client could set xattr value outside of BuildKit state directory
? CVE-2026-121520
What could go wrong?
Microsoft fixed a security weakness. Details are limited to avoid helping attackers.
How urgent is it?
Check Microsoft’s page for details.
Who is affected?
azl3 docker-buildx 0.14.0-19 on Azure Linux 3.0, azl3 docker-compose 2.27.0-16 on Azure Linux 3.0, azl3 moby-engine 25.0.18-1 on Azure Linux 3.0
What should I do?
Install this month’s updates via Windows Update, Intune or your update tool, then restart.
Known problems
Microsoft lists known issues per update: no KB article listed. Official page.