Ubuntu alert USN-8138-2 (rust-tar)

From:
             
 
noreply+usn-bot@canonical.com
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8138-2] tar-rs vulnerability
Date:
             
 
Tue, 14 Apr 2026 20:09:58 +0000
Message-ID:
             
 
<E1wCk58-0008Ks-1X@lists.ubuntu.com>
==========================================================================
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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