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[USN-8477-3] tar regression

Posted on 22 July 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8477-3
July 22, 2026

tar regression
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

USN-8477-1 introduced a regression in tar

Software Description:
- tar: GNU tar archive utility

Details:

USN-8477-1 fixed a vulnerability in tar. That fix was incomplete and could
cause tar to fail to extract old archives that recorded a nonzero size for
directory entries, resulting in a regression.
This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that tar incorrectly handled certain crafted archive files.
An attacker could possibly use this to inject hidden files with
attacker-controlled content, bypassing pre-extraction inspection mechanisms.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
tar 1.35+dfsg-4ubuntu0.4

Ubuntu 24.04 LTS
tar 1.35+dfsg-3ubuntu0.4

Ubuntu 22.04 LTS
tar 1.34+dfsg-1ubuntu0.1.22.04.6

Ubuntu 20.04 LTS
tar 1.30+dfsg-7ubuntu0.20.04.4+esm3
Available with Ubuntu Pro

Ubuntu 18.04 LTS
tar 1.29b-2ubuntu0.4+esm4
Available with Ubuntu Pro

Ubuntu 16.04 LTS
tar 1.28-2.1ubuntu0.2+esm6
Available with Ubuntu Pro

Ubuntu 14.04 LTS
tar 1.27.1-1ubuntu0.1+esm7
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8477-3
https://ubuntu.com/security/notices/USN-8477-2
https://ubuntu.com/security/notices/USN-8477-1
CVE-2026-5704, https://launchpad.net/bugs/2161311

Package Information:
https://launchpad.net/ubuntu/+source/tar/1.35+dfsg-4ubuntu0.4
https://launchpad.net/ubuntu/+source/tar/1.35+dfsg-3ubuntu0.4
https://launchpad.net/ubuntu/+source/tar/1.34+dfsg-1ubuntu0.1.22.04.6

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