CVE-2021-28676: Fedoraproject Fedora

High severity, CVSS 7.5. EPSS: 2.5% chance of exploitation in the next 30 days.

An issue was discovered in Pillow before 8.2.0. For FLI data, FliDecode did not properly check that the block advance was non-zero, potentially leading to an infinite loop on load.

Affected products

• Fedoraproject Fedora: version 33 only
• Python Pillow: before 8.2.0 (fixed in 8.2.0)

Published 2021-06-02. Last modified 2026-06-17.