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Ubuntu 20.04 LTS tar-rs Key Remote Permissions Mod Flaw USN-8138-2

ubuntu
Calendar Grey April 14, 2026
Dist Ubuntu Esm H88
tar-rs in Ubuntu 20.04 LTS has a critical issue modifying permissions via crafted tar archives.
tar-rs could be made to modify permissions on arbitrary directories.

Summary

tar-rs could be made to modify permissions on arbitrary directories.

Software Description:

- rust-tar: A tar archive reading/writing library for Rust

Details:

USN-8138-1 fixed a vulnerability in tar-rs. This update provides the

corresponding update for Ubuntu 20.04 LTS.

Original advisory details:

It was discovered that tar-rs incorrectly handled symlinks when unpacking

a tar archive. If a user or automated system were tricked into processing

a specially crafted tar archive, a remote attacker could use this issue to

modify permissions of arbitrary directories outside the extraction root,

and possibly escalate privileges.

Topics%20covered

Topics Covered

security advisory remote attack Ubuntu important permission modification rust-tar

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS
  librust-tar-dev                 0.4.26-1ubuntu0.1
                                  Available with Ubuntu Pro

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

References

https://ubuntu.com/security/notices/USN-8138-2

https://ubuntu.com/security/notices/USN-8138-1

CVE-2026-33056

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8138-2

Topics%20covered

Topics Covered

security advisory remote attack Ubuntu important permission modification rust-tar

Package Information

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