---
title: "CVE-2023-39743\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-2023-39743?format=md
keywords: index, follow
---

# CVE-2023-39743

Publication date 17 August 2023

Last updated 11 July 2025

---

Ubuntu priority

**Low**

[Why this priority?](https://ubuntu.com/security/CVE-2023-39743?format=md#priority-reason )

## Cvss 3 Severity Score

**5.3 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2023-39743?format=md#impact-score)

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## Description

lrzip-next LZMA v23.01 was discovered to contain an access violation via
the component /bz3\_decode\_block src/libbz3.c.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2023-39743?format=md#notes)

### Why is this CVE low priority?

client application crash only

[Learn more about Ubuntu priority](https://ubuntu.com/security/cves/about#priority)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| lrzip | 26.04 LTS resolute | Needs evaluation |
| 25.10 questing | Ignored end of life, was needs-triage |
| 25.04 plucky | Ignored end of life, was needs-triage |
| 24.10 oracular | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 23.10 mantic | Ignored end of life, was needs-triage |
| 23.04 lunar | Ignored end of life, was needs-triage |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |
| 14.04 LTS trusty | 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)

## Notes

---

### [rodrigo-zaiden](https://launchpad.net/~rodrigo-zaiden)

reported in lrzip-next that is a "Updated and Enhanced
version of ckolivas' lrzip project", but the affected source can also be
found in lrzip.

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.3 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | Low |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.3 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-39743)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2023-39743)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2023-39743)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2023-39743)

### Other references

* <https://github.com/pete4abw/lrzip-next/issues/132>
* <https://github.com/huanglei3/lrzip-next-poc/tree/main>
* <https://www.cve.org/CVERecord?id=CVE-2023-39743>