Ubuntu 26.04 Tar Important Directory Injection Fix USN-8477-3

ubuntu

July 22, 2026

USN-8477-1 introduced a regression in tar

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.

Topics Covered

security advisory update Ubuntu important tar directory injection

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.