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Fencer Vulns
high 8.8

CVE-2025-66287 json

Webkitgtk: processing maliciously crafted web content may lead to an unexpected process crash

published 2025-12-04 11 mo ago modified 2026-11-04 4 d ago also EUVD-2025-201244

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 43%
public exploits
0
none known

Summary

A flaw was found in WebKitGTK. Processing malicious web content can cause an unexpected process crash due to improper memory handling.

Patch / fix

  • The WebKitGTK Team WebKitGTK 2.50.3
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.50.3-2.el7_9
  • Red Hat Red Hat Enterprise Linux 8 0:2.50.3-1.el8_10
  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 0:2.50.3-2.el8_2
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.50.3-2.el8_4
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:2.50.3-2.el8_4
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.50.3-2.el8_6
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 0:2.50.3-2.el8_6
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 0:2.50.3-2.el8_6
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:2.50.3-2.el8_8
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:2.50.3-2.el8_8
  • Red Hat Red Hat Enterprise Linux 9 0:2.50.3-1.el9_7
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:2.50.3-1.el9_0
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.50.3-1.el9_2
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:2.50.3-1.el9_4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:2.50.3-1.el9_6
  • wpewebkit Debian 14 2.50.3-1
  • webkit2gtk Debian 12 2.50.3-1~deb12u1
  • webkit2gtk Debian 13 2.50.3-1~deb13u1
  • webkit2gtk Debian 14 2.50.3-1

debian advisories DEBIAN-CVE-2025-66287

  • webkit2gtk Ubuntu 22.04 LTS 2.50.3-0ubuntu0.22.04.1
  • webkit2gtk Ubuntu 24.04 LTS 2.50.3-0ubuntu0.24.04.1
  • webkit2gtk Ubuntu 25.10 2.50.3-0ubuntu0.25.10.1

ubuntu advisories UBUNTU-CVE-2025-66287

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 9 2.50.3-1.el9_7
  • webkit2gtk3-jsc RHEL 9 2.50.3-1.el9_7
  • webkit2gtk3 RHEL 8 2.50.3-1.el8_10
  • webkit2gtk3-jsc RHEL 8 2.50.3-1.el8_10
  • webkit2gtk3 RHEL 8.6 TUS, RHEL 8.6 E4S, RHEL 8.6 AUS 2.50.3-2.el8_6
  • webkit2gtk3-jsc RHEL 8.6 TUS, RHEL 8.6 E4S, RHEL 8.6 AUS 2.50.3-2.el8_6
  • webkit2gtk3 RHEL 8.8 TUS, RHEL 8.8 E4S 2.50.3-2.el8_8
  • webkit2gtk3-jsc RHEL 8.8 TUS, RHEL 8.8 E4S 2.50.3-2.el8_8

red hat advisories RHSA-2025:23743RHSA-2025:23742RHSA-2025:23583RHSA-2025:23591RHSA-2025:23452RHSA-2025:23451

  • webkit2gtk3 SLES for SAP applications 16.0, SLES 16.0 2.50.4-160000.1.1
  • webkit2gtk4 SLES for SAP applications 16.0, SLES 16.0 2.50.4-160000.1.1
  • webkit2gtk3 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Desktop Applications 15 SP7 +2 more 2.50.4-150600.12.54.1
  • webkit2gtk4 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 +4 more 2.50.4-150600.12.54.1
  • webkit2gtk3-soup2 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 +2 more 2.50.4-150600.12.54.1
  • webkit2gtk3 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.50.3-150400.4.130.4
  • webkit2gtk4 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.50.3-150400.4.130.4
  • webkit2gtk3-soup2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +7 more 2.50.3-150400.4.130.4

suse advisories SUSE-SU-2026:20102-1SUSE-SU-2026:0021-1SUSE-SU-2025:4423-1SUSE-SU-2025:4416-1

  • webkit2gtk3 openSUSE Leap 16.0 2.50.4-160000.1.1
  • webkit2gtk4 openSUSE Leap 16.0 2.50.4-160000.1.1
  • webkit2gtk3-soup2 openSUSE Leap 16.0 2.50.4-160000.1.1

opensuse advisories openSUSE-SU-2026:20065-1

  • webkit2gtk3 AlmaLinux 8 2.50.3-1.el8_10
  • webkit2gtk3-jsc AlmaLinux 8 2.50.3-1.el8_10
  • webkit2gtk3 AlmaLinux 9 2.50.3-1.el9_7
  • webkit2gtk3-jsc AlmaLinux 9 2.50.3-1.el9_7

almalinux advisories ALSA-2025:22789ALSA-2025:22790

  • webkit2gtk3 Rocky Linux 9 2.50.3-1.el9_7
  • webkit2gtk3 Rocky Linux 8 2.50.3-1.el8_10

rocky linux advisories RLSA-2025:22790RLSA-2025:22789

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-2025-66287 updated cvss 8.8

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

  • Red Hat Enterprise Linux 6 webkitgtk Red Hat Enterprise Linux 7 webkitgtk3, libwebkit2gtk
    affected: workaround, no fix planned “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.”
  • Red Hat Enterprise Linux AppStream (v. 8) webkit2gtk3 2.50.3-1.el8_10, webkit2gtk3-jsc 2.50.3-1.el8_10
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2025:22789
  • Red Hat Enterprise Linux AppStream (v. 9) webkit2gtk3 2.50.3-1.el9_7, webkit2gtk3-jsc 2.50.3-1.el9_7
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2025:22790
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) webkit2gtk3 2.50.3-2.el8_2, webkit2gtk3-jsc 2.50.3-2.el8_2
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2025:23433
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) webkit2gtk3 2.50.3-2.el8_4, webkit2gtk3-jsc 2.50.3-2.el8_4
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2025:23434
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) webkit2gtk3 2.50.3-2.el8_6, webkit2gtk3-jsc 2.50.3-2.el8_6 Red Hat Enterprise Linux AppStream E4S (v.8.6) webkit2gtk3 2.50.3-2.el8_6, webkit2gtk3-jsc 2.50.3-2.el8_6
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2025:23743
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) webkit2gtk3 2.50.3-2.el8_8, webkit2gtk3-jsc 2.50.3-2.el8_8
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2025:23742
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) webkit2gtk3 2.50.3-1.el9_0, webkit2gtk3-jsc 2.50.3-1.el9_0
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2025:23452
show 7 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) webkit2gtk3 2.50.3-1.el9_2, webkit2gtk3-jsc 2.50.3-1.el9_2
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2025:23451
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) webkit2gtk3 2.50.3-1.el9_4, webkit2gtk3-jsc 2.50.3-1.el9_4
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2025:23591
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) webkit2gtk3 2.50.3-1.el9_6, webkit2gtk3-jsc 2.50.3-1.el9_6
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2025:23110
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) webkit2gtk3 2.50.3-2.el8_4, webkit2gtk3-jsc 2.50.3-2.el8_4
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2025:23434
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) webkit2gtk3 2.50.3-2.el8_6, webkit2gtk3-jsc 2.50.3-2.el8_6
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2025:23743
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) webkit2gtk3 2.50.3-2.el8_8, webkit2gtk3-jsc 2.50.3-2.el8_8
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2025:23742
  • Red Hat Enterprise Linux Server (v. 7 ELS) webkitgtk4 2.50.3-2.el7_9, webkitgtk4-jsc 2.50.3-2.el7_9 Red Hat Enterprise Linux Server Optional (v. 7 ELS) webkitgtk4-doc 2.50.3-2.el7_9, webkitgtk4-devel 2.50.3-2.el7_9, webkitgtk4-debuginfo 2.50.3-2.el7_9, webkitgtk4-jsc-devel 2.50.3-2.el7_9
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2025:23583

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
11 mo ago

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
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

  • The WebKitGTK Team WebKitGTK
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input

References

Sources

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.