Description
An issue was discovered in certain Apple products. iOS before 11.3 is affected. Safari before 11.1 is affected. iCloud before 7.4 on Windows is affected. iTunes before 12.7.4 on Windows is affected. tvOS before 11.3 is affected. watchOS before 4.3 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.
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 | webkit2gtk | 2.20.0-2 | — |
| Debian 13 | webkit2gtk | 2.20.0-2 | — |
| Debian 12 | webkit2gtk | 2.20.0-2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | qtwebkit-opensource-src | No fix yet | — |
| Ubuntu 22.04 LTS | qtwebkit-opensource-src | No fix yet | — |
| Ubuntu 20.04 LTS | qtwebkit-opensource-src | No fix yet | — |
| Ubuntu 18.04 LTS | webkitgtk +2 | No fix yet | — |
| Ubuntu 16.04 LTS | webkit2gtk | 2.20.1-0ubuntu0.16.04.1 | — |
| Ubuntu 16.04 LTS | webkitgtk +2 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | PackageKit +8 | 1.1.10-1.el7 | RHSA-2018:3140 |
| RHEL 7 | accountsservice +2 | 0.6.50-2.el7 | RHSA-2018:3140 |
| RHEL 7 | adwaita-gtk2-theme +1 | 3.28-2.el7 | RHSA-2018:3140 |
| RHEL 7 | appstream-data | 7-20180614.el7 | RHSA-2018:3140 |
| RHEL 7 | at-spi2-atk +1 | 2.26.2-1.el7 | RHSA-2018:3140 |
| RHEL 7 | at-spi2-core +1 | 2.28.0-1.el7 | RHSA-2018:3140 |
| RHEL 7 | atk +1 | 2.28.1-1.el7 | RHSA-2018:3140 |
| RHEL 7 | baobab +1 | 3.28.0-2.el7 | RHSA-2018:3140 |
| RHEL 7 | bolt | 0.4-3.el7 | RHSA-2018:3140 |
| RHEL 7 | brasero +3 | 3.12.2-5.el7 | RHSA-2018:3140 |
| RHEL 7 | cairo +4 | 1.15.12-3.el7 | RHSA-2018:3140 |
| RHEL 7 | cheese +2 | 2:3.28.0-1.el7 | RHSA-2018:3140 |
| RHEL 7 | clutter-gst3 +1 | 3.0.26-1.el7 | RHSA-2018:3140 |
| RHEL 7 | compat-exiv2-023 | 0.23-2.el7 | RHSA-2018:3140 |
| RHEL 7 | compat-libical1 | 1.0.1-2.el7 | RHSA-2018:3140 |
| RHEL 7 | control-center +1 | 1:3.28.1-4.el7 | RHSA-2018:3140 |
| RHEL 7 | dconf +1 | 0.28.0-4.el7 | RHSA-2018:3140 |
| RHEL 7 | devhelp +2 | 1:3.28.1-1.el7 | RHSA-2018:3140 |
| RHEL 7 | ekiga | 4.0.1-8.el7 | RHSA-2018:3140 |
| RHEL 7 | empathy | 3.12.13-1.el7 | RHSA-2018:3140 |
| RHEL 7 | eog +3 | 3.28.3-1.el7 | RHSA-2018:3140 |
| RHEL 7 | evince +5 | 3.28.2-5.el7 | RHSA-2018:3140 |
| RHEL 7 | evolution +9 | 3.28.5-2.el7 | RHSA-2018:3140 |
| RHEL 7 | evolution-ews +7 | 3.28.5-1.el7 | RHSA-2018:3140 |
| RHEL 7 | evolution-mapi +1 | 3.28.3-2.el7 | RHSA-2018:3140 |
| RHEL 7 | file-roller +3 | 3.28.1-2.el7 | RHSA-2018:3140 |
| RHEL 7 | flatpak +2 | 1.0.2-2.el7 | RHSA-2018:3140 |
| RHEL 7 | flatpak-builder | 1.0.0-2.el7 | RHSA-2018:3140 |
| RHEL 7 | folks +2 | 1:0.11.4-1.el7 | RHSA-2018:3140 |
| RHEL 7 | fontconfig +2 | 2.13.0-4.3.el7 | RHSA-2018:3140 |
| RHEL 7 | freetype | 2.8-12.el7 | RHSA-2018:3140 |
| RHEL 7 | fwupd | 1.0.8-4.el7 | RHSA-2018:3140 |
| RHEL 7 | fwupdate +2 | 12-5.el7 | RHSA-2018:3140 |
| RHEL 7 | gcr +15 | 3.28.0-1.el7 | RHSA-2018:3140 |
| RHEL 7 | gdk-pixbuf2 | 2.36.12-3.el7 | RHSA-2018:3140 |
| RHEL 7 | gdm | 1:3.28.2-9.el7 | RHSA-2018:3140 |
| RHEL 7 | geoclue2 +1 | 2.4.8-1.el7 | RHSA-2018:3140 |
| RHEL 7 | geocode-glib | 3.26.0-2.el7 | RHSA-2018:3140 |
| RHEL 7 | gjs | 1.52.3-1.el7 | RHSA-2018:3140 |
| RHEL 7 | glade +1 | 3.22.1-1.el7 | RHSA-2018:3140 |
| RHEL 7 | glib-networking | 2.56.1-1.el7 | RHSA-2018:3140 |
| RHEL 7 | glib2 | 2.56.1-2.el7 | RHSA-2018:3140 |
| RHEL 7 | glibmm24 | 2.56.0-1.el7 | RHSA-2018:3140 |
| RHEL 7 | gnome-bluetooth +1 | 1:3.28.2-1.el7 | RHSA-2018:3140 |
| RHEL 7 | gnome-dictionary | 3.26.1-2.el7 | RHSA-2018:3140 |
| RHEL 7 | gnome-keyring +8 | 3.28.2-1.el7 | RHSA-2018:3140 |
| RHEL 7 | gnome-session +11 | 3.28.1-5.el7 | RHSA-2018:3140 |
| RHEL 7 | gnome-shell | 3.28.3-6.el7 | RHSA-2018:3140 |
| RHEL 7 | gnome-software | 3.28.2-3.el7 | RHSA-2018:3140 |
| RHEL 7 | gobject-introspection | 1.56.1-1.el7 | RHSA-2018:3140 |
| RHEL 7 | gom | 0.3.3-1.el7 | RHSA-2018:3140 |
| RHEL 7 | google-noto-emoji-fonts +1 | 20180508-4.el7 | RHSA-2018:3140 |
| RHEL 7 | grilo | 0.3.6-1.el7 | RHSA-2018:3140 |
| RHEL 7 | grilo-plugins | 0.3.7-1.el7 | RHSA-2018:3140 |
| RHEL 7 | gspell | 1.6.1-1.el7 | RHSA-2018:3140 |
| RHEL 7 | gssdp +3 | 1.0.2-1.el7 | RHSA-2018:3140 |
| RHEL 7 | gstreamer1-plugins-base | 1.10.4-2.el7 | RHSA-2018:3140 |
| RHEL 7 | gtk3 +2 | 3.22.30-3.el7 | RHSA-2018:3140 |
| RHEL 7 | gtksourceview3 | 3.24.8-1.el7 | RHSA-2018:3140 |
| RHEL 7 | gucharmap +1 | 10.0.4-1.el7 | RHSA-2018:3140 |
| RHEL 7 | gupnp | 1.0.2-5.el7 | RHSA-2018:3140 |
| RHEL 7 | gupnp-igd | 0.2.5-2.el7 | RHSA-2018:3140 |
| RHEL 7 | gvfs +9 | 1.36.2-1.el7 | RHSA-2018:3140 |
| RHEL 7 | harfbuzz +1 | 1.7.5-2.el7 | RHSA-2018:3140 |
| RHEL 7 | json-glib | 1.4.2-2.el7 | RHSA-2018:3140 |
| RHEL 7 | libappstream-glib | 0.7.8-2.el7 | RHSA-2018:3140 |
| RHEL 7 | libchamplain +1 | 0.12.16-2.el7 | RHSA-2018:3140 |
| RHEL 7 | libcroco | 0.6.12-4.el7 | RHSA-2018:3140 |
| RHEL 7 | libgdata | 0.17.9-1.el7 | RHSA-2018:3140 |
| RHEL 7 | libgee | 0.20.1-1.el7 | RHSA-2018:3140 |
| RHEL 7 | libgepub | 0.6.0-1.el7 | RHSA-2018:3140 |
| RHEL 7 | libgexiv2 | 0.10.8-1.el7 | RHSA-2018:3140 |
| RHEL 7 | libgnomekbd +2 | 3.26.0-1.el7 | RHSA-2018:3140 |
| RHEL 7 | libgovirt | 0.3.4-1.el7 | RHSA-2018:3140 |
| RHEL 7 | libgtop2 | 2.38.0-3.el7 | RHSA-2018:3140 |
| RHEL 7 | libgweather +3 | 3.28.2-2.el7 | RHSA-2018:3140 |
| RHEL 7 | libgxps | 0.3.0-4.el7 | RHSA-2018:3140 |
| RHEL 7 | libical | 3.0.3-2.el7 | RHSA-2018:3140 |
| RHEL 7 | libjpeg-turbo | 1.2.90-6.el7 | RHSA-2018:3140 |
| RHEL 7 | libmediaart | 1.9.4-1.el7 | RHSA-2018:3140 |
| RHEL 7 | libosinfo | 1.1.0-2.el7 | RHSA-2018:3140 |
| RHEL 7 | libpeas +2 | 1.22.0-1.el7 | RHSA-2018:3140 |
| RHEL 7 | librsvg2 +1 | 2.40.20-1.el7 | RHSA-2018:3140 |
| RHEL 7 | libsecret | 0.18.6-1.el7 | RHSA-2018:3140 |
| RHEL 7 | libsoup | 2.62.2-2.el7 | RHSA-2018:3140 |
| RHEL 7 | libwnck3 | 3.24.1-2.el7 | RHSA-2018:3140 |
| RHEL 7 | mozjs52 | 52.9.0-1.el7 | RHSA-2018:3140 |
| RHEL 7 | mutter | 3.28.3-4.el7 | RHSA-2018:3140 |
| RHEL 7 | nautilus +1 | 3.26.3.1-2.el7 | RHSA-2018:3140 |
| RHEL 7 | nautilus-sendto | 1:3.8.6-1.el7 | RHSA-2018:3140 |
| RHEL 7 | openchange | 2.3-3.el7 | RHSA-2018:3140 |
| RHEL 7 | osinfo-db | 20180531-1.el7 | RHSA-2018:3140 |
| RHEL 7 | pango | 1.42.4-1.el7 | RHSA-2018:3140 |
| RHEL 7 | poppler +3 | 0.26.5-20.el7 | RHSA-2018:3140 |
| RHEL 7 | pyatspi +1 | 2.26.0-3.el7 | RHSA-2018:3140 |
| RHEL 7 | redhat-logos | 70.0.3-7.el7 | RHSA-2018:3140 |
| RHEL 7 | rest | 0.8.1-2.el7 | RHSA-2018:3140 |
| RHEL 7 | rhythmbox | 3.4.2-2.el7 | RHSA-2018:3140 |
| RHEL 7 | seahorse-nautilus | 3.11.92-11.el7 | RHSA-2018:3140 |
| RHEL 7 | shotwell | 0.28.4-1.el7 | RHSA-2018:3140 |
| RHEL 7 | totem +1 | 1:3.26.2-1.el7 | RHSA-2018:3140 |
| RHEL 7 | totem-pl-parser | 3.26.1-1.el7 | RHSA-2018:3140 |
| RHEL 7 | upower | 0.99.7-1.el7 | RHSA-2018:3140 |
| RHEL 7 | vino | 3.22.0-7.el7 | RHSA-2018:3140 |
| RHEL 7 | vte291 +1 | 0.52.2-2.el7 | RHSA-2018:3140 |
| RHEL 7 | wayland +5 | 1.15.0-1.el7 | RHSA-2018:3140 |
| RHEL 7 | wayland-protocols +1 | 1.14-1.el7 | RHSA-2018:3140 |
| RHEL 7 | webkitgtk4 +2 | 2.20.5-1.el7 | RHSA-2018:3140 |
| RHEL 7 | yelp +2 | 2:3.28.1-1.el7 | RHSA-2018:3140 |
| RHEL 7 | zenity +17 | 3.28.1-1.el7 | RHSA-2018:3140 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | webkit2gtk3 | 2.20.3-2.23.8 | SUSE-SU-2018:3387-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | webkit2gtk3 | 2.20.3-2.23.8 | SUSE-SU-2018:3387-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- WebKit - WebAssembly Parsing Does not Correctly Check Section Order EDB-44427 · dos · Apr 9, 2018 · verified
GitHub 3 repositories
-
FSecureLABS/CVE-2018-4121 ★ 119 · Apr 19, 2018
macOS 10.13.3 (17D47) Safari Wasm Exploit
-
jezzus/CVE-2018-4121 ★ 0 · Sep 6, 2018
-
likekabin/CVE-2018-4121 ★ 0 · Jul 17, 2018
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 2
- RHSA-2018:3140 Red Hat Security Advisory: GNOME security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- SUSE-SU-2018:3387-1 Security update for webkit2gtk3 SUSE / openSUSE Security Updates · Feb 4, 2026
References
- 1040604 vdb-entry
- https://support.apple.com/HT208698
- GLSA-201808-04 vendor-advisory
- https://support.apple.com/HT208696
- https://support.apple.com/HT208693
- https://support.apple.com/HT208694
- https://github.com/mwrlabs/CVE-2018-4121
- https://support.apple.com/HT208697
- 44427 exploit
- https://support.apple.com/HT208695