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Ubuntu 25.10 Cargo-C Significant Permission Escalation Flaw USN-8139-1

ubuntu
Calendar Grey April 1, 2026
Dist Ubuntu Esm H88
Cargo-c vulnerability on Ubuntu allows permission modifications on directories, posing a risk to system integrity. Update recommended.
cargo-c could be made to modify permissions on arbitrary directories.

Summary

cargo-c could be made to modify permissions on arbitrary directories.

Software Description:

- rust-cargo-c: Helper program to build and install c-like libraries

Details:

It was discovered that tar-rs embedded in cargo-c 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 access Ubuntu important permission escalation rust-cargo-c

Update Instructions

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

Ubuntu 25.10
  cargo-c                         0.10.11-1ubuntu1.1
  librust-cargo-c-dev             0.10.11-1ubuntu1.1

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

References

https://ubuntu.com/security/notices/USN-8139-1

CVE-2026-33056

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8139-1

Topics%20covered

Topics Covered

security advisory remote access Ubuntu important permission escalation rust-cargo-c

Package Information

https://launchpad.net/ubuntu/+source/rust-cargo-c/0.10.11-1ubuntu1.1

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