CVE-2026-43699

Overview

Impact:

Description: Processing maliciously crafted web content may lead to an unexpected process crash

Researchers: Tommy DeVoss from Braze Security Team (@thedawgyg)

Background

Advisory: Apple Security Advisory

Fix not public. The WebKit fix for this bug is embargoed or not yet disclosed. The bug ID is confirmed from the Apple advisory, but no public commit references it.

Root Cause Analysis

A use-after-free issue was addressed with improved memory management.

Audit Directions

When auditing for this vulnerability, focus on: (1) similar patterns in the patched functions and nearby code, (2) missing or insufficient bounds checks on user-controlled input, (3) unvalidated type conversions and pointer arithmetic, (4) edge cases not exercised by tests, and (5) copy-paste variants of the vulnerable logic elsewhere.