Ubuntu Security Notices USN-8138-2 USN-8138-2: tar-rs vulnerability Publication date 14 April 2026 Overview tar-rs could be made to modify permissions on arbitrary directories. Releases 20.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Related notices Packages rust-tar - A tar archive reading/writing library for Rust Details USN-8138-1 fixed a vulnerability in tar-rs. This update provides the corresponding update for Ubuntu 20.04 LTS. Original advisory details: It was discovered that tar-rs incorrectly handled symlinks when unpacking a tar archive. If a user or automated system were tricked into processing a specially crafted tar archive, a remote attacker could use this issue to modify permissions of arbitrary directories outside the extraction root, and possibly escalate privileges. USN-8138-1 fixed a vulnerability in tar-rs. This update provides the corresponding update for Ubuntu 20.04 LTS. Original advisory details: It was discovered that tar-rs incorrectly handled symlinks when unpacking a tar archive. If a user or automated system were tricked into processing a specially crafted tar archive, a remote attacker could use this issue to modify permissions of arbitrary directories outside the extraction root, and possibly escalate privileges. Update instructions In general, a standard system update will 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 20.04 LTS focal librust-tar-dev – 0.4.26-1ubuntu0.1 Ubuntu Pro Fix available with Ubuntu Pro . 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-2026-33056 CVE-2026-33056 Related notices USN-8168-1 USN-8168-2 USN-8139-1 USN-8138-1 USN-8168-1 USN-8168-2 USN-8139-1 USN-8138-1