---
title: "CVE-2019-11922\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-2019-11922?format=md
keywords: index, follow
---

# CVE-2019-11922

Publication date 25 July 2019

Last updated 25 August 2025

---

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-2019-11922?format=md#impact-score)

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## Description

A race condition in the one-pass compression functions of Zstandard prior
to version 1.3.8 could allow an attacker to write bytes out of bounds if an
output buffer smaller than the recommended size was used.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| libzstd | 22.10 kinetic | Not affected |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Not affected |
| 20.10 groovy | Not affected |
| 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 19.04 disco | Not affected |
| 18.04 LTS bionic | Fixed 1.3.3+dfsg-2ubuntu1.1 |
| 16.04 LTS xenial | Fixed 1.3.1+dfsg-1~ubuntu0.16.04.1+esm2  Ubuntu Pro |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2019-11922?format=md#patch-details)

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### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| libzstd | * Upstream:   [3e5cdf1](https://github.com/facebook/zstd/commit/3e5cdf1b6a85843e991d7d10f6a2567c15580da0) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

8.1 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.1 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11922)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-11922)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-11922)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-11922)

### Related Ubuntu Security Notices (USN)

+ [USN-4108-1](https://usn.ubuntu.com/USN-4108-1)
+ Zstandard vulnerability
+ 21 August 2019

+ [USN-5593-1](https://usn.ubuntu.com/USN-5593-1)
+ Zstandard vulnerability
+ 1 September 2022

### Other references

* <https://github.com/facebook/zstd/pull/1404/commits/3e5cdf1b6a85843e991d7d10f6a2567c15580da0>
* <https://www.facebook.com/security/advisories/cve-2019-11922>
* <https://www.cve.org/CVERecord?id=CVE-2019-11922>