# CVE-2019-11922: libzstd1: A race condition in the one-pass compression functions of Zstandard prior to version 1.3.8 could allow an attacker to...

CVE-2019-11922 is fixed in 2 products on 1 platform, first by libzstd1 1.3.3+dfsg-2ubuntu1.1, released July 24, 2019. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2019-11922
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0142
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 24, 2019

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libzstd1 Ubuntu 18.04.6 LTS (bionic) | 1.3.3+dfsg-2ubuntu1.1 | [libzstd1 1.3.3+dfsg-2ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libzstd1-1.3.3-dfsg-2ubuntu1.1.md) | Jul 24, 2019 |
| Linux | zstd Ubuntu 18.04.6 LTS (bionic) | 1.3.3+dfsg-2ubuntu1.1 | [zstd 1.3.3+dfsg-2ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-zstd-1.3.3-dfsg-2ubuntu1.1.md) | Jul 24, 2019 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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