A use-after-free issue was addressed with improved memory management.

published 2026-07-27 3 mo ago modified 2026-10-26 13 d ago also EUVD-2026-49618

cvss: 5.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 17%
public exploits: 0; none known

A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 26.6, Safari 27, iOS 26.6 and iPadOS 26.6, iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, visionOS 27, watchOS 26.6. Processing maliciously crafted web content may lead to an unexpected Safari crash.

Patch / fix

fixed in 6 distros 4

Apple Safari 26.6, 27
Apple iOS and iPadOS 26.6, 26.7, 27
Apple macOS 26.6, 27
Apple tvOS 26.6
Apple visionOS 26.6, 27
Apple watchOS 26.6

red hat suse almalinux rocky linux

webkit2gtk3 RHEL 8 2.54.0-1.el8_10
webkit2gtk3-jsc RHEL 8 2.54.0-1.el8_10
webkit2gtk3 RHEL 9 2.54.0-1.el9_8
webkit2gtk3-jsc RHEL 9 2.54.0-1.el9_8

red hat advisories RHSA-2026:74084 RHSA-2026:69098

webkit2gtk3 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.54.1-150400.4.157.4
webkit2gtk4 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.54.1-150400.4.157.4
webkit2gtk3-soup2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.54.1-150400.4.157.5
webkit2gtk3 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Desktop Applications 15 SP7 2.54.1-150600.12.81.3
webkit2gtk4 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 +1 more 2.54.1-150600.12.81.4
webkit2gtk3-soup2 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 2.54.1-150600.12.81.4

suse advisories SUSE-SU-2026:4868-1 SUSE-SU-2026:4858-1

webkit2gtk3 AlmaLinux 8 2.54.0-1.el8_10
webkit2gtk3-jsc AlmaLinux 8 2.54.0-1.el8_10
webkit2gtk3 AlmaLinux 9 2.54.0-1.el9_8
webkit2gtk3-jsc AlmaLinux 9 2.54.0-1.el9_8

almalinux advisories ALSA-2026:74084 ALSA-2026:69098

webkit2gtk3 Rocky Linux 8 2.54.0-1.el8_10
webkit2gtk3 Rocky Linux 9 2.54.0-1.el9_8

rocky linux advisories RLSA-2026:74084 RLSA-2026:69098

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-64718 updated 2026-11-05 cvss 8.8

webkitgtk: Processing maliciously crafted web content may lead to an unexpected Safari crash

Red Hat Enterprise Linux 6 webkitgtk
affected: workaround, no fix planned “Out of support scope”
Red Hat Enterprise Linux AppStream (v. 8) webkit2gtk3 2.54.0-1.el8_10, webkit2gtk3-jsc 2.54.0-1.el8_10
fixed: vendor fix RHSA-2026:74084
Red Hat Enterprise Linux AppStream (v. 9) webkit2gtk3 2.54.0-1.el9_8, webkit2gtk3-jsc 2.54.0-1.el9_8
fixed: vendor fix RHSA-2026:69098
Red Hat Enterprise Linux AppStream AUS (v.8.4) webkit2gtk3 2.54.0-1.el8_4, webkit2gtk3-jsc 2.54.0-1.el8_4
fixed: vendor fix RHSA-2026:95403
Red Hat Enterprise Linux AppStream AUS (v.8.6) webkit2gtk3 2.54.0-1.el8_6, webkit2gtk3-jsc 2.54.0-1.el8_6
fixed: vendor fix RHSA-2026:92339
Red Hat Enterprise Linux AppStream E4S (v.8.8) webkit2gtk3 2.54.0-1.el8_8, webkit2gtk3-jsc 2.54.0-1.el8_8
fixed: vendor fix RHSA-2026:93435
Red Hat Enterprise Linux AppStream E4S (v.9.2) webkit2gtk3 2.54.0-1.el9_2, webkit2gtk3-jsc 2.54.0-1.el9_2
fixed: vendor fix RHSA-2026:89822
Red Hat Enterprise Linux AppStream E4S (v.9.4) webkit2gtk3 2.54.0-1.el9_4, webkit2gtk3-jsc 2.54.0-1.el9_4
fixed: vendor fix RHSA-2026:92216

show 6 more

Red Hat Enterprise Linux AppStream EUS (v.9.6) webkit2gtk3 2.54.0-1.el9_6, webkit2gtk3-jsc 2.54.0-1.el9_6
fixed: vendor fix RHSA-2026:89821
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) webkit2gtk3 2.54.0-1.el8_4, webkit2gtk3-jsc 2.54.0-1.el8_4
fixed: vendor fix RHSA-2026:95403
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) webkit2gtk3 2.54.0-1.el8_6, webkit2gtk3-jsc 2.54.0-1.el8_6
fixed: vendor fix RHSA-2026:92339
Red Hat Enterprise Linux AppStream TUS (v.8.8) webkit2gtk3 2.54.0-1.el8_8, webkit2gtk3-jsc 2.54.0-1.el8_8
fixed: vendor fix RHSA-2026:93435
Red Hat Enterprise Linux Server (v. 7 ELS) webkitgtk4 2.54.0-1.el7_9, webkitgtk4-jsc 2.54.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7 ELS) webkitgtk4-doc 2.54.0-1.el7_9, webkitgtk4-devel 2.54.0-1.el7_9, webkitgtk4-debuginfo 2.54.0-1.el7_9, webkitgtk4-jsc-devel 2.54.0-1.el7_9
fixed: vendor fix RHSA-2026:91631
Red Hat Enterprise Linux 7 webkitgtk3, libwebkit2gtk
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 3 mo ago (2026-07-28)

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

Apple Safari
Apple iOS and iPadOS
Apple macOS
Apple tvOS
Apple visionOS
Apple watchOS

Classification

Weakness

CWE-416 Use After Free

References

support.apple.com /en-us/128066
release-notes, vendor-advisory
support.apple.com /en-us/128067
release-notes, vendor-advisory
support.apple.com /en-us/128068
release-notes, vendor-advisory
support.apple.com /en-us/128069
release-notes, vendor-advisory
support.apple.com /en-us/128070
release-notes, vendor-advisory
support.apple.com /en-us/128073
release-notes, vendor-advisory
support.apple.com /en-us/149034
support.apple.com /en-us/149035
support.apple.com /en-us/149038
support.apple.com /en-us/149039
support.apple.com /en-us/149041

Sources

CVE List CVE-2026-64718
NVD CVE-2026-64718

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary