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ZDI-26-610: Apple Safari JavaScriptCore B3 ReduceStrength Phase Use-After-Free Remote Code Execution Vulnerability

ZDI details a use-after-free in Apple Safari's JavaScriptCore (CVE-2026-64715) that allows remote code execution after a user visits a malicious page.

The Zero Day Initiative published advisory ZDI-26-610 for a use-after-free in the B3 ReduceStrength phase of Apple Safari's JavaScriptCore. Successful exploitation allows remote attackers to execute arbitrary code, but user interaction is required, such as visiting a malicious page or opening a malicious file. ZDI rates the vulnerability 8.8 on CVSS and assigned CVE-2026-64715. The advisory does not report exploitation in the wild.

ZDI Published Advisories · 22d agoVulnerabilityCVE-2026-64715

Related CVEs

  • CVE-2026-647156.5<1%
    Use-After-Free in Apple Safari and iOS/iPadOS/macOS Web Content Processing
    CVE-2026-64715 is a use-after-free (CWE-416) memory-safety flaw in Apple's web content processing stack, addressed with improved memory management in Safari 26.6.1, iOS/iPadOS 18.7.10 and 26.6.1, and macOS Tahoe 26.6.2. It is triggered when a user processes maliciously crafted web content — typically by visiting an attacker-controlled webpage in Safari or another WebKit-based view. Per Apple's advisory, a successful trigger leads to an unexpected process crash (denial of service), reflected in the CVSS score of 6.5 with availability-only impact, though the related Zero Day Initiative advisory (ZDI-26-610) characterizes the JavaScriptCore B3 ReduceStrength use-after-free as potentially leading to remote code execution. All users of the affected Safari, iOS, iPadOS, and macOS versions on Apple hardware are exposed until they apply the updates. There is currently no known exploitation in the wild, no public proof-of-concept, no CISA KEV listing, and a low EPSS score (0.4% probability of exploitation in 30 days).
    · apple Safari versions prior to 26.6.1 · apple iPhone OS (iOS) versions prior to 18.7.10 and versions prior to 26.6.1 (both supported update branches)mass

Appears with

product Safari 1vendor Apple 1vendor Zero Day Initiative 1
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