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Fencer Vulns
medium 5.9

CVE-2018-4266 json

A race condition was addressed with additional validation.

published 2019-04-03 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-16052

cvss
5.9
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

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.

Patch / fix

  • apple safari 11.1.2
  • apple icloud 7.6
  • apple itunes 12.8
  • apple iphone_os 11.4.1
  • apple tvos 11.4.1
  • apple watchos 4.3.2
  • webkit2gtk Debian 14, Debian 13, Debian 12 2.20.4-1

debian advisories DEBIAN-CVE-2018-4266

  • webkit2gtk Ubuntu 16.04 LTS 2.20.5-0ubuntu0.16.04.1
  • webkit2gtk Ubuntu 18.04 LTS 2.20.5-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2018-4266

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 SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +12 more 2.22.4-2.29.3
  • webkit2gtk3 SLE Module for Desktop Applications 15, SLE Module for Basesystem 15 2.20.5-3.8.1

suse advisories SUSE-SU-2019:0059-1SUSE-SU-2018:2752-1

  • webkit2gtk Alpine 3.8 2.20.4-r0

alpine advisories ALPINE-CVE-2018-4266

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Exploit prediction

1.78% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

  • n/a iOS, tvOS, watchOS, Safari, iTunes for Windows, iCloud for Windows

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

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.