CVE-2020-13962: Fedoraproject Fedora

High severity, CVSS 7.5. EPSS: 3% chance of exploitation in the next 30 days.

Qt 5.12.2 through 5.14.2, as used in unofficial builds of Mumble 1.3.0 and other products, mishandles OpenSSL's error queue, which can cause a denial of service to QSslSocket users. Because errors leak in unrelated TLS sessions, an unrelated session may be disconnected when any handshake fails. (Mumble 1.3.1 is not affected, regardless of the Qt version.)

Affected products

• Fedoraproject Fedora: version 31 only; version 32 only; version 33 only
• Mumble Mumble: version 1.3.0 only
• Opensuse Leap: version 15.2 only
• Qt Qt: from 5.12.2, before 5.12.9 (fixed in 5.12.9); from 5.13.0, up to and including 5.13.2; from 5.14.0, up to and including 5.14.2

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