It was discovered that BuildKit, contained within Docker, incorrectly handled file path validation when processing frontend API messages. An attacker could possibly use this issue to write files outside of the intended state directory. ( CVE-2026-33747 ) It was discovered that BuildKit, contained within Docker, incorrectly validated the subdir component of Git URL fragments. An attacker could possibly use this issue to access files outside of the checked-out repository root. ( CVE-2026-33748 )
It was discovered that BuildKit, contained within Docker, incorrectly handled file path validation when processing frontend API messages. An attacker could possibly use this issue to write files outside of the intended state directory. ( CVE-2026-33747 )
It was discovered that BuildKit, contained within Docker, incorrectly validated the subdir component of Git URL fragments. An attacker could possibly use this issue to access files outside of the checked-out repository root. ( CVE-2026-33748 )
It was discovered that BuildKit, contained within Docker, incorrectly handled file path validation when processing frontend API messages. An attacker could possibly use this issue to write files outside of the intended state directory. ( CVE-2026-33747 ) It was discovered that BuildKit, contained within Docker, incorrectly validated the subdir component of Git URL fragments. An attacker could possibly use this issue to access files outside of the checked-out repository root. ( CVE-2026-33748 )
It was discovered that BuildKit, contained within Docker, incorrectly handled file path validation when processing frontend API messages. An attacker could possibly use this issue to write files outside of the intended state directory. ( CVE-2026-33747 )
It was discovered that BuildKit, contained within Docker, incorrectly validated the subdir component of Git URL fragments. An attacker could possibly use this issue to access files outside of the checked-out repository root. ( CVE-2026-33748 )
After a standard system update you need to restart Docker to make all the necessary changes.
The problem can be corrected by updating your system to the following package versions:
Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.
The full story
This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.
