high 8.8

CVE-2026-64757 json

A memory corruption issue was addressed with improved state management.

published 2026-07-27 3 mo ago modified 2026-08-17 2 mo ago also EUVD-2026-49438

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits: 0; none known

A memory corruption issue was addressed with improved state management. This issue is fixed in Safari 26.6, iOS 18.7.10 and iPadOS 18.7.10, iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, visionOS 26.6, watchOS 26.6. Processing maliciously crafted web content may lead to an unexpected Safari crash.

Patch / fix

fixed in 5 distros 7

Apple Safari 26.6
Apple iOS and iPadOS 18.7.10, 26.6
Apple macOS 26.6
Apple visionOS 26.6
Apple watchOS 26.6

debian ubuntu red hat suse opensuse almalinux rocky linux

wpewebkit Debian 14 2.52.6-1
webkit2gtk Debian 13 2.52.6-1~deb13u1
webkit2gtk Debian 14 2.52.6-1

debian advisories DEBIAN-CVE-2026-64757

webkit2gtk Ubuntu 24.04 LTS 2.52.6-0ubuntu0.24.04.1
webkit2gtk Ubuntu 26.04 LTS 2.52.6-0ubuntu0.26.04.1

ubuntu advisories UBUNTU-CVE-2026-64757

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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 applications 16.0, SLES 16.0 2.54.1-160000.1.1
webkit2gtk4 SLES for SAP applications 16.0, SLES 16.0 2.54.1-160000.1.1
webkit2gtk3 SLE Module for Desktop Applications 15 SP7 2.52.6-150600.12.74.1
webkit2gtk4 SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 2.52.6-150600.12.74.1
webkit2gtk3-soup2 SLE Module for Basesystem 15 SP7 2.52.6-150600.12.74.1
webkit2gtk3 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.52.6-150400.4.149.2
webkit2gtk4 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.52.6-150400.4.149.2
webkit2gtk3-soup2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.52.6-150400.4.149.2

suse advisories SUSE-SU-2026:24225-1 SUSE-SU-2026:4020-1 SUSE-SU-2026:4001-1

webkit2gtk3 openSUSE Leap 16.0 2.54.1-160000.1.1
webkit2gtk4 openSUSE Leap 16.0 2.54.1-160000.1.1
webkit2gtk3-soup2 openSUSE Leap 16.0 2.54.1-160000.1.1

opensuse advisories openSUSE-SU-2026:22076-1

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-2026-64757 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: total
Assessed: 3 mo ago (2026-07-28)

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

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

Classification

Weakness

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

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/128070
release-notes, vendor-advisory
support.apple.com /en-us/128073
release-notes, vendor-advisory
support.apple.com /en-us/148287

Sources

CVE List CVE-2026-64757
NVD CVE-2026-64757

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