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Ubuntu 25.10 Rust-Tar Key Permissions Escalation USN-8138-1 CVE-2026-33056

ubuntu
Calendar Grey April 1, 2026
Dist Ubuntu Esm H88
A critical rust-tar issue allows permission modifications on arbitrary directories. Update for Ubuntu systems to secure your environment.
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:

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 privilege escalation Ubuntu important permissions issue rust-tar

Update Instructions

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

Ubuntu 25.10
  librust-tar-dev                 0.4.43-4ubuntu0.1

Ubuntu 24.04 LTS
  librust-tar-dev                 0.4.40-1ubuntu0.1

Ubuntu 22.04 LTS
  librust-tar+default-dev         0.4.37-3ubuntu0.1
  librust-tar-dev                 0.4.37-3ubuntu0.1

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

References

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

CVE-2026-33056

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8138-1

Topics%20covered

Topics Covered

security advisory privilege escalation Ubuntu important permissions issue rust-tar

Package Information

https://launchpad.net/ubuntu/+source/rust-tar/0.4.43-4ubuntu0.1
https://launchpad.net/ubuntu/+source/rust-tar/0.4.40-1ubuntu0.1
https://launchpad.net/ubuntu/+source/rust-tar/0.4.37-3ubuntu0.1

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