Apple Safari stack overflow via malformed web content (pre-26.5.2)
CVE-2026-43718 Published on June 29, 2026
A stack overflow was addressed with improved input validation. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may lead to an unexpected Safari crash.
Vulnerability Analysis
CVE-2026-43718 is exploitable with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is a Stack Overflow Vulnerability?
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
CVE-2026-43718 has been classified to as a Stack Overflow vulnerability or weakness.
Products Associated with CVE-2026-43718
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Affected Versions
Apple Safari:- Before 26.5.2 is affected.
- Before 26.5.2 is affected.
- Before 26.5.2 is affected.