CVE-2023-3255: Fedoraproject Fedora

Medium severity, CVSS 6.5. EPSS: 1.9% chance of exploitation in the next 30 days.

A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. A wrong exit condition may lead to an infinite loop when inflating an attacker controlled zlib buffer in the `inflate_buffer` function. This could allow a remote authenticated client who is able to send a clipboard to the VNC server to trigger a denial of service.

Affected products

• Fedoraproject Fedora: version 38 only
• Qemu Qemu: up to and including 8.0.3
• Red Hat Enterprise Linux: version 8.0 only; version 9.0 only

Published 2023-09-13. Last modified 2026-06-17.