CVE-2020-8927: Canonical Ubuntu Linux

Medium severity, CVSS 6.5. EPSS: 3.2% chance of exploitation in the next 30 days.

A buffer overflow exists in the Brotli library versions prior to 1.0.8 where an attacker controlling the input length of a "one-shot" decompression request to a script can trigger a crash, which happens when copying over chunks of data larger than 2 GiB. It is recommended to update your Brotli library to 1.0.8 or later. If one cannot update, we recommend to use the "streaming" API as opposed to the "one-shot" API, and impose chunk size limits.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 20.04 only
• Debian Debian Linux: version 9.0 only; version 10.0 only
• Fedoraproject Fedora: version 31 only; version 32 only; version 33 only; version 34 only; version 35 only; version 36 only
• Google Brotli: before 1.0.8 (fixed in 1.0.8)
• Microsoft .net: from 5.0, up to and including 5.0.14
• Microsoft .net Core: from 3.1, up to and including 3.1.22
• Microsoft PowerShell: from 7.0, before 7.0.9 (fixed in 7.0.9); from 7.1, before 7.1.6 (fixed in 7.1.6); from 7.2, before 7.2.2 (fixed in 7.2.2)
• Microsoft Visual Studio 2019: from 16.0, up to and including 16.11
• Microsoft Visual Studio 2022: from 17.0, up to and including 17.0.7; version 17.1 only
• Opensuse Leap: version 15.2 only

Published 2020-09-15. Last modified 2026-06-17.