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Ubuntu 26.04 Tar Critical File Overwrite Threat USN-8477-1 CVE-2026-5704

ubuntu
Calendar Grey June 30, 2026
Dist Ubuntu Esm H88
Ubuntu's tar utility faces a critical flaw allowing file overwrites via crafted archives. Update your system now.
tar could be made to overwrite files if it opened a specially crafted archive.

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.

Topics%20covered

Topics Covered

security advisory critical Ubuntu tar file overwriting archive manipulation

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

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8477-1

Topics%20covered

Topics Covered

security advisory critical Ubuntu tar file overwriting archive manipulation

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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