CVE-2017-5949: Apple Safari

Critical severity, CVSS 9.8. EPSS: 1.8% chance of exploitation in the next 30 days.

JavaScriptCore in WebKit, as distributed in Safari Technology Preview Release 22, allows remote attackers to cause a denial of service (heap-based out-of-bounds write and application crash) or possibly have unspecified other impact via crafted JavaScript code that triggers access to red-zone memory locations, related to jit/ThunkGenerators.cpp, llint/LowLevelInterpreter32_64.asm, and llint/LowLevelInterpreter64.asm.

Affected products

• Apple Safari: version 22 only

Published 2017-04-03. Last modified 2026-06-17.