CVE-2026-43718

Description

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.

CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0028

Probability of exploitation

0.20%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-121 CWE-121

Affected Products

Vendor	Product	Versions
apple	safari	< 26.5.2
apple	ipados	< 26.5.2
apple	iphone_os	< 26.5.2
apple	macos	26.0 — 26.5.2

References

Advisories & Patches

https://support.apple.com/en-us/127594 https://support.apple.com/en-us/127595 https://support.apple.com/en-us/127685

Frequently Asked Questions

What is CVE-2026-43718? +

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-43718? +

CVE-2026-43718 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0028, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-43718? +

CVE-2026-43718 affects products from apple, specifically: ipados, iphone_os, macos, safari. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-43718? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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