docker.io: BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner
CVE-2026-33747 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-33747, released March 27, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, when using a custom BuildKit frontend, the frontend can craft an API message that causes files to be written outside of the BuildKit state directory for the execution context. The issue has been fixed in v0.28.1. The vulnerability requires using an untrusted BuildKit frontend set with `#syntax` or `--build-arg BUILDKIT_SYNTAX`. Using these options with a well-known frontend image like `docker/dockerfile` is not affected.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| docker.io · Debian 13.5 (trixie) | 26.1.5+dfsg1-9+deb13u1 | DEBIAN-CVE-2026-33747 | Mar 27, 2026 |
| docker.io · Debian 14 | 28.5.2+dfsg4-3 | DEBIAN-CVE-2026-33747 | Mar 27, 2026 |
| docker.io · Ubuntu 20.04 LTS (focal) | 26.1.3-0ubuntu1~20.04.1+esm2 | docker.io 26.1.3-0ubuntu1~20.04.1+esm2 | May 15, 2026 |
| docker.io · Ubuntu 22.04.1 LTS (jammy) | 29.1.3-0ubuntu3~22.04.2 | docker.io 29.1.3-0ubuntu3~22.04.2 | May 15, 2026 |
| docker.io · Ubuntu 24.04.5 LTS (noble) | 29.1.3-0ubuntu3~24.04.2 | docker.io 29.1.3-0ubuntu3~24.04.2 | May 15, 2026 |
| docker.io · Ubuntu 26.04.1 LTS (resolute) | 29.1.3-0ubuntu4.1 | docker.io 29.1.3-0ubuntu4.1 | Apr 21, 2026 |
| govulncheck-vulndb · opensuse-leap 15.6 | 0.0.20260402T184258-150000.1.158.1 | SUSE-SU-2026:1205-1 | Apr 7, 2026 |
| govulncheck-vulndb · opensuse-leap 16.0 | 0.0.20260723T184607-160000.1.1 | OPENSUSE-SU-2026:21483-1 | Jul 30, 2026 |
| tailscale · opensuse-leap 16.0 | 1.104.1-bp160.1.1 | OPENSUSE-SU-2026:22203-1 | Nov 7, 2026 |
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