CVE-2023-43786: Fedoraproject Fedora

Medium severity, CVSS 5.5. EPSS: 0.5% chance of exploitation in the next 30 days.

A vulnerability was found in libX11 due to an infinite loop within the PutSubImage() function. This flaw allows a local user to consume all available system resources and cause a denial of service condition.

Affected products

• Fedoraproject Fedora: version 38 only
• Red Hat Enterprise Linux: version 8.0 only; version 9.0 only
• X.org LIBX11: before 1.8.7 (fixed in 1.8.7)

Published 2023-10-10. Last modified 2026-06-17.