PatchTheCVECVE-2018-19873: An issue was discovered in Qt before 5.11.3
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CRITICAL 9.8REMOTEWATCHLISTUPGRADEMITIGATEMITIGATE
CVE-2018-19873 is a critical-severity flaw (CVSS 9.8) affecting qt, backports, leap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An issue was discovered in Qt before 5.11.3. QBmpHandler has a buffer overflow via BMP data.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 3.4% (top 11%) |
| CISA exploited list | No |
| Weakness | CWE-119 |
| Published | 2018-12-26 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
qt qt UPGRADE
Affected: <= 5.5.1 · >= 5.7.0 and <= 5.8.0 · >= 5.10.0 and < 5.11.3
Fixed in: 5.11.3
Safe to downgrade to: a release before 5.7.0
1. Check installed version
apt-cache policy qt || rpm -q qt || qt --version
2. UPGRADE to 5.11.3 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade qt
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade qt
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 5.7.0 (Debian / Ubuntu)
apt-cache madison qt
sudo apt install qt=<VERSION_BEFORE_5.7.0>
sudo apt-mark hold qt
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list qt
sudo dnf downgrade qt-<VERSION_BEFORE_5.7.0>
sudo dnf versionlock add qt
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
opensuse backports MITIGATE
Affected: sle-15 sp1 · sle-15 sp2
Fixed in: no fixed release known
Safe to downgrade to: a release before sle-15
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
opensuse leap MITIGATE
Affected: 15.1 · 15.2 · 42.3
Fixed in: no fixed release known
Safe to downgrade to: a release before 15.1
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
debian debian linux MITIGATE
Affected: 8.0 · 9.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 8.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
canonical ubuntu linux MITIGATE
Affected: 16.04 · 18.04 · 18.10
Fixed in: no fixed release known
Safe to downgrade to: a release before 16.04
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2018-19873?
qt: upgrade to 5.11.3; backports: mitigate or apply the listed mitigation; leap: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2018-19873 being exploited?
CVE-2018-19873 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2018-19873 affect?
CVE-2018-19873 affects qt, backports, leap. Severity is critical (CVSS 9.8). An issue was discovered in Qt before 5.11.3. QBmpHandler has a buffer overflow via BMP data.
How urgent is CVE-2018-19873?
Priority 66/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist
Software pages
Ubuntu vulnerabilities · Debian vulnerabilities
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