[USN-8477-3] tar regression

[noreply+usn-bot at canonical.com]

==========================================================================
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
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: OpenPGP digital signature
URL: <https://lists.ubuntu.com/archives/ubuntu-security-announce/attachments/20260722/1e5fc7ea/attachment.sig>