Description
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.)
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | qtbase-opensource-src | 5.14.2+dfsg-6 | — |
| Debian 13 | qtbase-opensource-src | 5.14.2+dfsg-6 | — |
| Debian 12 | qtbase-opensource-src | 5.14.2+dfsg-6 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | qtbase-opensource-src | 5.12.8+dfsg-0ubuntu2.1+esm3 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | qt5-qtbase +9 | 5.12.5-6.el8 | RHSA-2020:4690 |
| RHEL 8 | qt5-qttools +15 | 5.12.5-2.el8 | RHSA-2020:4690 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | qt5-qtbase-static | 5.12.5-6.el8 | ALSA-2020:4690 |
| AlmaLinux 8 | qt5-qttools-static | 5.12.5-2.el8 | ALSA-2020:4690 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | qt5-qtwebsockets | 5.12.5-2.el8 | RLSA-2020:4690 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | libqt5-qtbase | 5.12.7-4.3.1 | SUSE-SU-2020:2357-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libqt5-qtbase | 5.15.2+kde268-2.1 | openSUSE-SU-2024:11742-1 |
| openSUSE Leap 15.2 | libqt5-qtbase | 5.12.7-lp152.3.3.1 | openSUSE-SU-2020:1319-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | qt5-qtsvg | 5.12.11-3 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | qt5-qtbase +9 | 5.12.5-6.el8 | ELSA-2020-4690 |
| Oracle Linux 8 | qt5-qttools +15 | 5.12.5-2.el8 | ELSA-2020-4690 |
Advisories 7
- ALSA-2020:4690 Moderate: qt5-qtbase and qt5-qtwebsockets security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2020:4690 Red Hat Security Advisory: qt5-qtbase and qt5-qtwebsockets security and bug fix update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RLSA-2020:4690 Moderate: qt5-qtbase and qt5-qtwebsockets security and bug fix update Rocky Linux Security Advisories · Feb 5, 2026
- openSUSE-SU-2024:11742-1 libQt5Bootstrap-devel-static-32bit-5.15.2+kde268-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2357-1 Security update for libqt5-qtbase SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1319-1 Security update for libqt5-qtbase SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2020-4690 Moderate: qt5-qtbase and qt5-qtwebsockets security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 10, 2020
References
- https://github.com/mumble-voip/mumble/pull/4032
- https://bugreports.qt.io/browse/QTBUG-83450
- https://github.com/mumble-voip/mumble/issues/3679
- GLSA-202007-18 vendor-advisory
- openSUSE-SU-2020:1319 vendor-advisory
- FEDORA-2020-f869e01557 vendor-advisory
- FEDORA-2020-ca26a3f832 vendor-advisory
- FEDORA-2020-8372f6bae4 vendor-advisory