Is CVE-2026-43809 being actively exploited?

CVE-2026-43809 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2026-43809?

CVE-2026-43809 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2026-43809

CRITICAL · CVSS 9.8EPSS 0.6%EU EUVD

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in iOS 18.7.10 and iPadOS 18.7.10, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to cause unexpected system termination.

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-125
EPSS score: 0.6% (48th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2026-49450)
Published: July 27, 2026
NVD last modified: August 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-49450 in the EU Vulnerability Database. Last updated in EUVD on August 17, 2026.

View on the EU Vulnerability Database

Affected products

apple / macos

Certified products that may be affected

10 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Apple macOS 26 Tahoe: FileVault - Apple Inc. - Common Criteria CCEVS-VR-VID-11696-2026 - active
Apple macOS 26 Tahoe - Apple Inc. - Common Criteria CCEVS-VR-VID-11695-2026 - active
Apple macOS 15 Sequoia - Apple Inc. - Common Criteria CCEVS-VR-VID-11648-2026 - active
Strong Customer Authentication for Apple Pay on MacBook Air 2024 with M3running macOS Sequoia 15.4 - Apple Inc. - Common Criteria 2025-11-INF-4674 - active
Apple macOS 14 Sonoma - Apple Inc. - Common Criteria CCEVS-VR-VID-11584-2025 - active

See all 10 in the Security Certifications Explorer.

References

https://support.apple.com/en-us/128067(Release Notes, Vendor Advisory)
https://support.apple.com/en-us/128071(Release Notes, Vendor Advisory)
https://support.apple.com/en-us/128072(Release Notes, Vendor Advisory)
https://support.apple.com/en-us/148287

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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