========================================================================== Ubuntu Security Notice USN-8138-2 April 14, 2026
rust-tar vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
Summary:
tar-rs could be made to modify permissions on arbitrary directories.
Software Description:
- 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.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.04 LTS
librust-tar-dev 0.4.26-1ubuntu0.1
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-8138-2
https://ubuntu.com/security/notices/USN-8138-1
CVE-2026-33056
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