CVE-2018-4124: An issue was discovered in certain Apple products.

Security readout for executives and security teams

CVE-2018-4124 is an Apple CoreText bug where a specially crafted string containing a Telugu character could crash affected Apple devices. The main documented impact is denial of service through memory corruption and system crash. The sources do not confirm active exploitation or a reliable path to code execution. Exposure is most likely on legacy or unmanaged Apple devices still running the listed pre-fix OS versions. Systems that render untrusted text are relevant because the trigger is a crafted string. Modern, updated Apple devices should not be considered exposed based on the supplied sources. Treat this as a legacy Apple fleet hygiene issue. It can disrupt affected devices through crashes, but the supplied evidence does not show active exploitation or confirmed code execution. Prioritize remediation where old Apple versions remain in business use. Mitigation focus: Update iOS devices to 11.2.6 or later.; Apply macOS 10.13.3 Supplemental Update or later.; Update tvOS devices to 11.2.6 or later..

Prepared

Jun 7, 2026, 14:03 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.