CVE-2019-8375: The UIProcess subsystem in WebKit, as used in WebKitGTK through 2.23.90 and WebKitGTK+ through 2.22.6 and othe

Q: How do I fix CVE-2019-8375?

webkitgtk: upgrade to newer than 2.23.90; webkitgtk\+: upgrade to newer than 2.22.6; leap: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2019-8375 being exploited?

CVE-2019-8375 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-2019-8375 affect?

CVE-2019-8375 affects webkitgtk, webkitgtk\+, leap. Severity is critical (CVSS 9.8). The UIProcess subsystem in WebKit, as used in WebKitGTK through 2.23.90 and WebKitGTK+ through 2.22.6 and other products, does not prevent the script dialog size from exceeding the web view size, which allows remote attackers to cause a den

Q: How urgent is CVE-2019-8375?

Priority 74/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 9.8REMOTEWATCHLISTUPGRADEUPGRADEMITIGATE

CVE-2019-8375 is a critical-severity flaw (CVSS 9.8) affecting webkitgtk, webkitgtk\+, leap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The UIProcess subsystem in WebKit, as used in WebKitGTK through 2.23.90 and WebKitGTK+ through 2.22.6 and other products, does not prevent the script dialog size from exceeding the web view size, which allows remote attackers to cause a denial of service (Buffer Overflow) or possibly have unspecified other impact, related to UIProcess/API/gtk/WebKitScriptDialogGtk.cpp, UIProcess/API/gtk/WebKitScriptDialogImpl.cpp, and UIProcess/API/gtk/WebKitWebV

Why this priority

Critical severity
EPSS top 3%: very likely to be exploited
Public exploit reference
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	15.7% (top 3%)
CISA exploited list	No
Weakness	CWE-119
Published	2019-02-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: canonical · opensuse · webkitgtk

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

Am I affected?

Timeline

2019-02-24 13:29 UTCPublished CVE record published
2026-06-17 02:41 UTCUpdated Record last modified

webkitgtk webkitgtk UPGRADE

Affected: <= 2.23.90

Fixed in: newer than 2.23.90

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy webkitgtk || rpm -q webkitgtk || webkitgtk --version

2. UPGRADE to newer than 2.23.90 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade webkitgtk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webkitgtk

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

webkitgtk webkitgtk\+ UPGRADE

Affected: <= 2.22.6

Fixed in: newer than 2.22.6

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy webkitgtk+ || rpm -q webkitgtk+ || webkitgtk+ --version

2. UPGRADE to newer than 2.22.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade webkitgtk+

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webkitgtk+

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

opensuse leap MITIGATE

Affected: 15.0 · 42.3

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.

canonical ubuntu linux MITIGATE

Affected: 18.04 · 18.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 18.04

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · nodejs-pnpm12 · FIXED · 12.17.0-1.fc46 · FEDORA-2026-7adfb2bcdd · source

sudo dnf upgrade --advisory=FEDORA-2026-7adfb2bcdd

Fedora ELN · wget2 · FIXED · 2.3.0-3.eln159 · FEDORA-2026-811b4922a5 · source

sudo dnf upgrade --advisory=FEDORA-2026-811b4922a5

Ubuntu 22.04 · webkit2gtk · NOT AFFECTED

Ubuntu 20.04 · webkit2gtk · NOT AFFECTED

Ubuntu 24.04 · webkit2gtk · NOT AFFECTED

Debian 12 · webkit2gtk · FIXED · 2.24.1-1

sudo apt update && sudo apt install --only-upgrade webkit2gtk dpkg --compare-versions "$(dpkg-query -W -f='${Version}' webkit2gtk)" ge "2.24.1-1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · webkit2gtk · FIXED · 2.24.1-1

sudo apt update && sudo apt install --only-upgrade webkit2gtk dpkg --compare-versions "$(dpkg-query -W -f='${Version}' webkit2gtk)" ge "2.24.1-1" && echo PATCHED || echo STILL-VULNERABLE

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: www.exploit-db.com/exploits/46465/
Write-up: www.inputzero.io/2019/02/fuzzing-webkit.html
Exploit-DB: WebKitGTK 2.23.90 / WebKitGTK+ 2.22.6 - Denial of Service

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-2019-8375?

webkitgtk: upgrade to newer than 2.23.90; webkitgtk\+: upgrade to newer than 2.22.6; leap: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-8375 being exploited?

CVE-2019-8375 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-2019-8375 affect?

CVE-2019-8375 affects webkitgtk, webkitgtk\+, leap. Severity is critical (CVSS 9.8). The UIProcess subsystem in WebKit, as used in WebKitGTK through 2.23.90 and WebKitGTK+ through 2.22.6 and other products, does not prevent the script dialog size from exceeding the web view size, which allows remote attackers to cause a den

How urgent is CVE-2019-8375?

Priority 74/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Ubuntu vulnerabilities · WebKit vulnerabilities · Apple Safari and WebKit vulnerabilities

Related CVEs

CVE-2019-8720 HIGH 8.8 EXPLOITED UPGRADE UPGRADE WebKitGTK Memory Corruption Vulnerability
CVE-2022-2294 HIGH 8.8 EXPLOITED UPGRADE DOWNGRADE WebRTC Heap Buffer Overflow Vulnerability
CVE-2023-42843 MEDIUM 4.3 UPGRADE UPGRADE An inconsistent user interface issue was addressed with improved state management
CVE-2023-40397 CRITICAL 9.8 UPGRADE UPGRADE The issue was addressed with improved checks
CVE-2023-39928 HIGH 8.8 DOWNGRADE MITIGATE A use-after-free vulnerability exists in the MediaRecorder API of Webkit WebKitGTK 2.40.5

References

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