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CVE-2025-43343

Apple Safari buffer overflow

9.8 CRITICALEPSS 0.78%
  1. Published15 Sept 2025

Description

The issue was addressed with improved memory handling. This issue is fixed in Safari 26, 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Apple Safari< 26.0
Webkitgtk< 2.50.1
Wpewebkit Wpe Webkit< 2.50.1
Apple iPadOS< 26.0
Apple iPhone OS< 26.0
Apple macOS< 26.0
Apple Tvos< 26.0
Apple Visionos< 26.0
Apple Watchos< 26.0

Remediation

Fixed in
Apple Safari≥ 26.0
Webkitgtk≥ 2.50.1
Wpewebkit Wpe Webkit≥ 2.50.1
Apple iPadOS≥ 26.0
Apple iPhone OS≥ 26.0
Apple macOS≥ 26.0
Apple Tvos≥ 26.0
Apple Visionos≥ 26.0
Apple Watchos≥ 26.0

References

and 5 more references

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Frequently asked

Is CVE-2025-43343 being actively exploited?

CVE-2025-43343 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.78%.

How severe is CVE-2025-43343?

CVE-2025-43343 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.78% probability of exploitation.

Which products are affected by CVE-2025-43343?

Affected products include Apple Safari, Webkitgtk, Wpewebkit Wpe Webkit, Apple iPadOS, Apple iPhone OS, and 4 more.

How do I fix CVE-2025-43343?

Upgrade affected software to a fixed version, for example Apple Safari 26.0, Webkitgtk 2.50.1, Wpewebkit Wpe Webkit 2.50.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-43343 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.