CVE-2023-40551: Fedoraproject Fedora

Medium severity, CVSS 5.1. EPSS: 0.4% chance of exploitation in the next 30 days.

A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or possible exposure of sensitive data during the system's boot phase.

Affected products

• Fedoraproject Fedora: version 39 only
• Red Hat Enterprise Linux: version 8.0 only; version 9.0 only
• Red Hat Shim: before 15.8 (fixed in 15.8)

Published 2024-01-29. Last modified 2026-06-17.