CVE-2019-11922: Facebook Zstandard

High severity, CVSS 8.1. EPSS: 1.4% chance of exploitation in the next 30 days.

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.

Affected products

• Facebook Zstandard: before 1.3.8 (fixed in 1.3.8)

Published 2019-07-25. Last modified 2026-06-17.