---
title: "CVE-2026-33055\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-33055?format=md
keywords: index, follow
---

# CVE-2026-33055

Publication date 20 March 2026

Last updated 10 July 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**8.1 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2026-33055?format=md#impact-score)

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## Description

tar-rs is a tar archive reading/writing library for Rust. Versions 0.4.44
and below have conditional logic that skips the PAX size header in cases
where the base header size is nonzero. As part of CVE-2025-62518, the
astral-tokio-tar project was changed to correctly honor PAX size headers in
the case where it was different from the base header. This is almost the
inverse of the astral-tokio-tar issue. Any discrepancy in how tar parsers
honor file size can be used to create archives that appear differently when
unpacked by different archivers. In this case, the tar-rs (Rust tar) crate
is an outlier in checking for the header size - other tar parsers
(including e.g. Go archive/tar) unconditionally use the PAX size override.
This can affect anything that uses the tar crate to parse archives and
expects to have a consistent view with other parsers. This issue has been
fixed in version 0.4.45.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| rust-tar | 26.04 LTS resolute | Needs evaluation |
| 25.10 questing | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:

CVSS v4.0

[CVSS v4.0](https://ubuntu.com/security/CVE-2026-33055?format=md)
[CVSS v3.0](https://ubuntu.com/security/CVE-2026-33055?format=md)

**Base score**

5.1 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Attack requirements | None |
  | Privileges required | None |
  | User interaction | Active |
  | Vulnerable system - Confidentiality impact | Low |
  | Vulnerable system - Integrity impact | Low |
  | Vulnerable system - Availability impact | None |
  | Subsequent system - Confidentiality impact | None |
  | Subsequent system - Integrity impact | None |
  | Subsequent system - Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.1 · Medium |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

**Vector:** CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33055)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-33055)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-33055)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-33055)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-33055>
* <https://github.com/alexcrichton/tar-rs/commit/de1a5870e603758f430073688691165f21a33946>
* <https://github.com/alexcrichton/tar-rs/security/advisories/GHSA-gchp-q4r4-x4ff>
* <https://www.cve.org/CVERecord?id=CVE-2025-62518>