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CVE-2018-4266

A race condition was addressed with additional validation. This issue affected versions prior...

5.9 MediumFix available

A race condition was addressed with additional validation. This issue affected versions prior toiVersions prior to: OS 11.4.1, tvOS 11.4.1, watchOS 4.3.2, Safari 11.1.2, iTunes 12.8 for Windows, iCloud for Windows 7.6.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.78%Down 0.6 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 5.9

A race condition was addressed with additional validation. This issue affected versions prior toiVersions prior to: OS 11.4.1, tvOS 11.4.1, watchOS 4.3.2, Safari 11.1.2, iTunes 12.8 for Windows, iCloud for Windows 7.6.

Record
CVE-2018-4266
CVSS 3.0
5.9 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness
CWE-362
Updated
2026-11-02
CVE List No score

A race condition was addressed with additional validation. This issue affected versions prior toiVersions prior to: OS 11.4.1, tvOS 11.4.1, watchOS 4.3.2, Safari 11.1.2, iTunes 12.8 for Windows, iCloud for Windows 7.6.

Record
CVE-2018-4266
Updated
2026-11-02
EUVDEUVD-2018-16052 No score

A race condition was addressed with additional validation. This issue affected versions prior toiVersions prior to: OS 11.4.1, tvOS 11.4.1, watchOS 4.3.2, Safari 11.1.2, iTunes 12.8 for Windows, iCloud for Windows 7.6.

Record
EUVD-2018-16052
Updated
2026-11-03
GitHub AdvisoriesGHSA-fvcx-grrr-x536 5.9

A race condition was addressed with additional validation. This issue affected versions prior...

A race condition was addressed with additional validation. This issue affected versions prior toiVersions prior to: OS 11.4.1, tvOS 11.4.1, watchOS 4.3.2, Safari 11.1.2, iTunes 12.8 for Windows, iCloud for Windows 7.6.

Record
GHSA-fvcx-grrr-x536
CVSS 3.0
5.9 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-362
Updated
2026-11-02
OSVALPINE-CVE-2018-4266 5.9

A race condition was addressed with additional validation. This issue affected versions prior toiVersions prior to: OS 11.4.1, tvOS 11.4.1, watchOS 4.3.2, Safari 11.1.2, iTunes 12.8 for Windows, iCloud for Windows 7.6.

Record
ALPINE-CVE-2018-4266
CVSS 3.0
5.9 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-03
OSV 5.9

A race condition was addressed with additional validation. This issue affected versions prior toiVersions prior to: OS 11.4.1, tvOS 11.4.1, watchOS 4.3.2, Safari 11.1.2, iTunes 12.8 for Windows, iCloud for Windows 7.6.

Record
CVE-2018-4266
CVSS 3.0
5.9 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 6 moreShow less
OSVDEBIAN-CVE-2018-4266 5.9

A race condition was addressed with additional validation. This issue affected versions prior toiVersions prior to: OS 11.4.1, tvOS 11.4.1, watchOS 4.3.2, Safari 11.1.2, iTunes 12.8 for Windows, iCloud for Windows 7.6.

Record
DEBIAN-CVE-2018-4266
CVSS 3.0
5.9 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2018-4266 5.9

A race condition was addressed with additional validation. This issue affected versions prior toiVersions prior to: OS 11.4.1, tvOS 11.4.1, watchOS 4.3.2, Safari 11.1.2, iTunes 12.8 for Windows, iCloud for Windows 7.6.

Record
UBUNTU-CVE-2018-4266
CVSS 3.0
5.9 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVMGASA-2018-0382 No score

Updated webkit2 packages fix security vulnerability

The webkit2 package has been updated to version 2.20.5, fixing several security issues and other bugs.

Record
MGASA-2018-0382
Updated
2026-11-02
OSVSUSE-SU-2018:2752-1 No score

Security update for webkit2gtk3

This update for webkit2gtk3 to version 2.20.5 fixes the following issues:

Security issue fixed:

  • CVE-2018-12911: Fix off-by-one in xdg_mime_get_simple_globs (bsc#1101999).
  • CVE-2018-4261, CVE-2018-4262, CVE-2018-4263, CVE-2018-4264, CVE-2018-4265, CVE-2018-4267, CVE-2018-4272, CVE-2018-4284: Processing maliciously crafted web content may lead to arbitrary code execution. A memory corruption issue was addressed with improved memory handling.
  • CVE-2018-4266: A malicious website may be able to cause a denial of service. A race condition was addressed with additional validation.
  • CVE-2018-4270, CVE-2018-4271, CVE-2018-4273: Processing maliciously crafted web content may lead to an unexpected application crash. A memory corruption issue was addressed with improved input validation.
  • CVE-2018-4278: A malicious website may exfiltrate audio data cross-origin. Sound fetched through audio elements may be exfiltrated cross-origin. This issue was addressed with improved audio taint tracking.

Other bugs fixed:

  • Fix rendering artifacts in some web sites due to a bug introduced in 2.20.4.
  • Fix a crash when leaving accelerated compositing mode.
  • Fix non-deterministic build failure due to missing JavaScriptCore/JSContextRef.h.
Record
SUSE-SU-2018:2752-1
Updated
2026-11-02
OSVSUSE-SU-2019:0059-1 No score

Security update for webkit2gtk3

This update for webkit2gtk3 to version 2.22.4 fixes the following issues:

Security issues fixed:

CVE-2018-4191, CVE-2018-4197, CVE-2018-4299, CVE-2018-4306, CVE-2018-4309, CVE-2018-4392, CVE-2018-4312, CVE-2018-4314, CVE-2018-4315, CVE-2018-4316, CVE-2018-4317, CVE-2018-4318, CVE-2018-4319, CVE-2018-4323, CVE-2018-4328, CVE-2018-4358, CVE-2018-4359, CVE-2018-4361, CVE-2018-4345, CVE-2018-4372, CVE-2018-4373, CVE-2018-4375, CVE-2018-4376, CVE-2018-4416, CVE-2018-4378, CVE-2018-4382, CVE-2018-4386 (bsc#1110279, bsc#1116998).

Record
SUSE-SU-2019:0059-1
Updated
2026-11-02
OSVUSN-3743-1 No score

webkit2gtk vulnerabilities

A large number of security issues were discovered in the WebKitGTK+ Web and JavaScript engines. If a user were tricked into viewing a malicious website, a remote attacker could exploit a variety of issues related to web browser security, including cross-site scripting attacks, denial of service attacks, and arbitrary code execution.

Record
USN-3743-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
webkit2gtk
Alpine:v3.8
 before 2.20.4-r0
2.20.4-r0
webkit2gtk
Debian:12
 before 2.20.4-1
2.20.4-1
webkit2gtk
Debian:13
 before 2.20.4-1
2.20.4-1
webkit2gtk
Debian:14
 before 2.20.4-1
2.20.4-1
webkit2
Mageia:6
From an advisory covering 12 CVEs
 before 2.20.5-1.mga6
2.20.5-1.mga6
webkit2gtk3
SUSE:Linux Enterprise Module for Basesystem 15
From an advisory covering 14 CVEs
 before 2.20.5-3.8.1
2.20.5-3.8.1
webkit2gtk3
SUSE:Linux Enterprise Module for Desktop Applications 15
From an advisory covering 14 CVEs
 before 2.20.5-3.8.1
2.20.5-3.8.1
webkit2gtk3
SUSE:OpenStack Cloud 7
From an advisory covering 45 CVEs
 before 2.22.4-2.29.3
2.22.4-2.29.3
webkit2gtk3
SUSE:Linux Enterprise Desktop 12 SP3
From an advisory covering 45 CVEs
 before 2.22.4-2.29.3
2.22.4-2.29.3
webkit2gtk3
SUSE:Linux Enterprise Desktop 12 SP4
From an advisory covering 45 CVEs
 before 2.22.4-2.29.3
2.22.4-2.29.3
Show 25 moreShow less
Affected packages
PackageAffectedFixed
webkit2gtk3
SUSE:Linux Enterprise Server for SAP Applications 12 SP2
From an advisory covering 45 CVEs
 before 2.22.4-2.29.3
2.22.4-2.29.3
webkit2gtk3
SUSE:Linux Enterprise Software Development Kit 12 SP3
From an advisory covering 45 CVEs
 before 2.22.4-2.29.3
2.22.4-2.29.3
webkit2gtk3
SUSE:Linux Enterprise Software Development Kit 12 SP4
From an advisory covering 45 CVEs
 before 2.22.4-2.29.3
2.22.4-2.29.3
webkit2gtk3
SUSE:Linux Enterprise Server 12 SP2-LTSS
From an advisory covering 45 CVEs
 before 2.22.4-2.29.3
2.22.4-2.29.3
webkit2gtk3
SUSE:Linux Enterprise Server 12 SP2-BCL
From an advisory covering 45 CVEs
 before 2.22.4-2.29.3
2.22.4-2.29.3
webkit2gtk3
SUSE:Linux Enterprise Server 12 SP3
From an advisory covering 45 CVEs
 before 2.22.4-2.29.3
2.22.4-2.29.3
webkit2gtk3
SUSE:Linux Enterprise Server for SAP Applications 12 SP3
From an advisory covering 45 CVEs
 before 2.22.4-2.29.3
2.22.4-2.29.3
webkit2gtk3
SUSE:Linux Enterprise Server 12 SP4
From an advisory covering 45 CVEs
 before 2.22.4-2.29.3
2.22.4-2.29.3
webkit2gtk3
SUSE:Linux Enterprise Server for SAP Applications 12 SP4
From an advisory covering 45 CVEs
 before 2.22.4-2.29.3
2.22.4-2.29.3
webkit2gtk3
SUSE:Linux Enterprise Workstation Extension 12 SP3
From an advisory covering 45 CVEs
 before 2.22.4-2.29.3
2.22.4-2.29.3
webkit2gtk3
SUSE:Linux Enterprise Workstation Extension 12 SP4
From an advisory covering 45 CVEs
 before 2.22.4-2.29.3
2.22.4-2.29.3
webkit2gtk3
SUSE:Enterprise Storage 4
From an advisory covering 45 CVEs
 before 2.22.4-2.29.3
2.22.4-2.29.3
webkit2gtk
Ubuntu:16.04:LTS
 before 2.20.5-0ubuntu0.16.04.1, plus listed versions
2.8.5+dfsg1-32.10.3+dfsg1-12.10.4+dfsg1-12.10.5-12.10.6-1
Show 20 moreShow less
2.10.6-1ubuntu12.10.8-1ubuntu12.10.9-1ubuntu12.12.5-0ubuntu0.16.04.12.14.2-0ubuntu0.16.04.12.14.3-0ubuntu0.16.04.12.14.5-0ubuntu0.16.04.12.16.1-0ubuntu0.16.04.12.16.1-0ubuntu0.16.04.22.16.2-0ubuntu0.16.04.12.16.3-0ubuntu0.16.04.12.16.6-0ubuntu0.16.04.12.18.0-0ubuntu0.16.04.22.18.3-0ubuntu0.16.04.12.18.4-0ubuntu0.16.04.12.18.5-0ubuntu0.16.04.12.18.6-0ubuntu0.16.04.12.20.1-0ubuntu0.16.04.12.20.2-0ubuntu0.16.04.12.20.3-0ubuntu0.16.04.1
2.20.5-0ubuntu0.16.04.1
qtwebkit-opensource-src
Ubuntu:16.04:LTS
 All versions, plus listed versions
5.4.2+dfsg-1ubuntu2.15.5.1+dfsg-2ubuntu1
 None known
qtwebkit-source
Ubuntu:16.04:LTS
 All versions, plus listed versions
2.3.2-0ubuntu102.3.2-0ubuntu11
 None known
webkitgtk
Ubuntu:16.04:LTS
 All versions, plus listed versions
2.4.9-2ubuntu22.4.10-0ubuntu12.4.11-0ubuntu0.1
 None known
webkit2gtk
Ubuntu:18.04:LTS
 before 2.20.5-0ubuntu0.18.04.1, plus listed versions
2.18.0-22.18.0-2build12.18.2-12.18.3-12.18.4-1
Show 9 moreShow less
2.18.6-12.19.91-1ubuntu12.19.92-12.20.0-12.20.0-22.20.0-2ubuntu12.20.1-12.20.2-0ubuntu0.18.04.12.20.3-0ubuntu0.18.04.1
2.20.5-0ubuntu0.18.04.1
qtwebkit-opensource-src
Ubuntu:18.04:LTS
 All versions, plus listed versions
5.9.1+dfsg-5ubuntu15.9.1+dfsg-5ubuntu35.212.0~alpha2-5build25.212.0~alpha2-5build45.212.0~alpha2-75.212.0~alpha2-7build25.212.0~alpha2-7ubuntu1
 None known
qtwebkit-source
Ubuntu:18.04:LTS
 All versions, plus listed versions
2.3.2-0ubuntu13
 None known
webkitgtk
Ubuntu:18.04:LTS
 All versions, plus listed versions
2.4.11-32.4.11-3ubuntu22.4.11-3ubuntu3
 None known
qtwebkit-opensource-src
Ubuntu:20.04:LTS
 All versions, plus listed versions
5.212.0~alpha3-35.212.0~alpha3-55.212.0~alpha3-65.212.0~alpha3-75.212.0~alpha4-15.212.0~alpha4-1ubuntu15.212.0~alpha4-1ubuntu25.212.0~alpha4-1ubuntu2.1
 None known
qtwebkit-opensource-src
Ubuntu:22.04:LTS
 All versions, plus listed versions
5.212.0~alpha4-125.212.0~alpha4-135.212.0~alpha4-145.212.0~alpha4-14build15.212.0~alpha4-14ubuntu25.212.0~alpha4-15ubuntu1
 None known
qtwebkit-opensource-src
Ubuntu:24.04:LTS
 All versions, plus listed versions
5.212.0~alpha4-335.212.0~alpha4-33build15.212.0~alpha4-345.212.0~alpha4-34ubuntu35.212.0~alpha4-34ubuntu45.212.0~alpha4-36
 None known
webkit2gtk
Ubuntu:16.04:LTS
From an advisory covering 14 CVEs
 before 2.20.5-0ubuntu0.16.04.1, plus listed versions
2.8.5+dfsg1-32.10.3+dfsg1-12.10.4+dfsg1-12.10.5-12.10.6-1
Show 20 moreShow less
2.10.6-1ubuntu12.10.8-1ubuntu12.10.9-1ubuntu12.12.5-0ubuntu0.16.04.12.14.2-0ubuntu0.16.04.12.14.3-0ubuntu0.16.04.12.14.5-0ubuntu0.16.04.12.16.1-0ubuntu0.16.04.12.16.1-0ubuntu0.16.04.22.16.2-0ubuntu0.16.04.12.16.3-0ubuntu0.16.04.12.16.6-0ubuntu0.16.04.12.18.0-0ubuntu0.16.04.22.18.3-0ubuntu0.16.04.12.18.4-0ubuntu0.16.04.12.18.5-0ubuntu0.16.04.12.18.6-0ubuntu0.16.04.12.20.1-0ubuntu0.16.04.12.20.2-0ubuntu0.16.04.12.20.3-0ubuntu0.16.04.1
2.20.5-0ubuntu0.16.04.1
webkit2gtk
Ubuntu:18.04:LTS
From an advisory covering 14 CVEs
 before 2.20.5-0ubuntu0.18.04.1, plus listed versions
2.18.0-22.18.0-2build12.18.2-12.18.3-12.18.4-1
Show 9 moreShow less
2.18.6-12.19.91-1ubuntu12.19.92-12.20.0-12.20.0-22.20.0-2ubuntu12.20.1-12.20.2-0ubuntu0.18.04.12.20.3-0ubuntu0.18.04.1
2.20.5-0ubuntu0.18.04.1

History

History
RecordedChangedSources
affected, facts
affected, aliases, referencesOSV
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-4266 is a medium vulnerability (CVSS 5.9) in Apple Icloud, published August 6, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.78%, the 78th percentile. Fixed in webkit2gtk 2.20.4-r0.

References

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