Ubuntu alert USN-8477-3 (tar)

From:
             
 
noreply+usn-bot--- via ubuntu-security-announce <ubuntu-security-announce@lists.ubuntu.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8477-3] tar regression
Date:
             
 
Wed, 22 Jul 2026 15:54:47 +0000
Message-ID:
             
 
<E1wmZHT-0002yf-6q@lists.ubuntu.com>
Cc:
             
 
noreply+usn-bot@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-4ubunt...
  https://launchpad.net/ubuntu/+source/tar/1.35+dfsg-3ubunt...
  https://launchpad.net/ubuntu/+source/tar/1.34+dfsg-1ubunt...


Attachment: signature.asc (type=application/pgp-signature)
-----BEGIN PGP SIGNATURE-----
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=jrvk
-----END PGP SIGNATURE-----