Ubuntu Security Notices USN-8230-1 USN-8230-1: Docker vulnerabilities Publication date 6 May 2026 Overview Several security issues were fixed in Docker. Releases 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Packages docker.io-app - Linux container runtime Details 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 ) Update instructions After a standard system update you need to restart Docker to make all the necessary changes. Learn more about how to get the fixes. The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 26.04 LTS resolute docker.io – 29.1.3-0ubuntu4.1 24.04 LTS noble docker.io – 29.1.3-0ubuntu3~24.04.2 22.04 LTS jammy docker.io – 29.1.3-0ubuntu3~22.04.2 20.04 LTS focal docker.io – 26.1.3-0ubuntu1~20.04.1+esm2 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. Reduce your security exposure 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. Get Ubuntu Pro References CVE-2026-33748 CVE-2026-33747 CVE-2026-33748 CVE-2026-33747