CVE-2018-19870: An issue was discovered in Qt before 5.11.3

Q: How do I fix CVE-2018-19870?

qt: upgrade to 5.11.3; debian linux: mitigate or apply the listed mitigation; leap: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2018-19870 being exploited?

CVE-2018-19870 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-19870 affect?

CVE-2018-19870 affects qt, debian linux, leap. Severity is high (CVSS 8.8). An issue was discovered in Qt before 5.11.3. A malformed GIF image causes a NULL pointer dereference in QGifHandler resulting in a segmentation fault.

Q: How urgent is CVE-2018-19870?

Priority 57/100. High severity; On your watchlist

This month

HIGH 8.8WATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2018-19870 is a high-severity flaw (CVSS 8.8) affecting qt, debian linux, 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. A malformed GIF image causes a NULL pointer dereference in QGifHandler resulting in a segmentation fault.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-476
Published	2018-12-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · opensuse · qt

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-12-26 21:29 UTCPublished CVE record published
2026-06-17 01:50 UTCUpdated Record last modified

qt qt UPGRADE

Affected: < 5.11.3

Fixed in: 5.11.3

Safe to downgrade to: no unaffected older release

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.

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.

opensuse leap MITIGATE

Affected: 15.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 15.0

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.

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.

Quick answers

How do I fix CVE-2018-19870?

qt: upgrade to 5.11.3; debian linux: mitigate or apply the listed mitigation; leap: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-19870 being exploited?

CVE-2018-19870 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-2018-19870 affect?

CVE-2018-19870 affects qt, debian linux, leap. Severity is high (CVSS 8.8). An issue was discovered in Qt before 5.11.3. A malformed GIF image causes a NULL pointer dereference in QGifHandler resulting in a segmentation fault.

How urgent is CVE-2018-19870?

Priority 57/100. High severity; On your watchlist

Software pages

Debian vulnerabilities

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References

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