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[USN-8477-1] tar vulnerability

Posted on 30 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8477-1
June 25, 2026

tar vulnerability
==========================================================================
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:

tar could be made to overwrite files if it opened a specially crafted
archive.

Software Description:
- tar: GNU tar archive utility

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-4ubuntu0.1

Ubuntu 24.04 LTS
tar 1.35+dfsg-3ubuntu0.1

Ubuntu 22.04 LTS
tar 1.34+dfsg-1ubuntu0.1.22.04.3

Ubuntu 20.04 LTS
tar 1.30+dfsg-7ubuntu0.20.04.4+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
tar 1.29b-2ubuntu0.4+esm2
Available with Ubuntu Pro

Ubuntu 16.04 LTS
tar 1.28-2.1ubuntu0.2+esm4
Available with Ubuntu Pro

Ubuntu 14.04 LTS
tar 1.27.1-1ubuntu0.1+esm5
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8477-1
CVE-2026-5704

Package Information:
https://launchpad.net/ubuntu/+source/tar/1.35+dfsg-4ubuntu0.1
https://launchpad.net/ubuntu/+source/tar/1.35+dfsg-3ubuntu0.1
https://launchpad.net/ubuntu/+source/tar/1.34+dfsg-1ubuntu0.1.22.04.3

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