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CVE-2025-43342

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-15 · updated 2026-10-18
• Weakness: CWE-20

Description

A correctness issue was addressed with improved checks. This issue is fixed in Safari 26, iOS 18.7 and iPadOS 18.7, iOS 26 and iPadOS 26, macOS Tahoe 26, tvOS 26, visionOS 26, watchOS 26. Processing maliciously crafted web content may lead to an unexpected process crash.

Affected products

• Apple iPadOS: before 18.7 — fixed in 18.7
• Apple Iphone Os: before 18.7 — fixed in 18.7
• Apple macOS: before 26.0 — fixed in 26.0
• Apple Safari: before 26.0 — fixed in 26.0
• Apple tvOS: before 26.0 — fixed in 26.0
• Apple visionOS: before 26.0 — fixed in 26.0
• Apple watchOS: before 26.0 — fixed in 26.0
• Webkit: before 2.48.7 — fixed in 2.48.7
• Wpewebkit Wpe Webkit: before 2.48.7 — fixed in 2.48.7

How to fix

Upgrade to a fixed version: Apple iPadOS 18.7; Apple Iphone Os 18.7; Apple macOS 26.0; Apple Safari 26.0; Apple tvOS 26.0; Apple visionOS 26.0; Apple watchOS 26.0; Webkit 2.48.7; Wpewebkit Wpe Webkit 2.48.7. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/125108
• https://support.apple.com/en-us/125109
• https://support.apple.com/en-us/125110
• https://support.apple.com/en-us/125113
• https://support.apple.com/en-us/125114
• https://support.apple.com/en-us/125115
• https://support.apple.com/en-us/125116
• http://seclists.org/fulldisclosure/2025/Sep/49
• http://seclists.org/fulldisclosure/2025/Sep/53
• http://seclists.org/fulldisclosure/2025/Sep/57
• http://seclists.org/fulldisclosure/2025/Sep/59
• http://www.openwall.com/lists/oss-security/2025/09/22/3

Get alerted when CVE-2025-43342 or the next vulnerability affects your stack