CVE-2026-43809

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

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:apple:macos::::::::
	cpe:2.3:o:apple:macos::::::::
	cpe:2.3:o:apple:macos::::::::

History

28 Jul 2026, 17:58

Type	Values Removed	Values Added
CPE		cpe:2.3:o:apple:macos::::::::
First Time		Apple Apple macos
References	~~() https://support.apple.com/en-us/128067 -~~	() https://support.apple.com/en-us/128067 - Release Notes, Vendor Advisory
References	~~() https://support.apple.com/en-us/128071 -~~	() https://support.apple.com/en-us/128071 - Release Notes, Vendor Advisory
References	~~() https://support.apple.com/en-us/128072 -~~	() https://support.apple.com/en-us/128072 - Release Notes, Vendor Advisory

28 Jul 2026, 16:18

Type	Values Removed	Values Added
CWE		CWE-125
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.8

27 Jul 2026, 21:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-27 21:17

Updated : 2026-07-28 17:58

NVD link : CVE-2026-43809

Mitre link : CVE-2026-43809

CVE.ORG link : CVE-2026-43809

JSON object : View

Products Affected

apple

macos

CWE

CWE-125

Out-of-bounds Read

{"id": "CVE-2026-43809", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43809", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-07-28T15:01:35.363212Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "affected": [{"source": "product-security@apple.com", "affectedData": [{"vendor": "Apple", "product": "macOS", "versions": [{"status": "affected", "version": "0", "lessThan": "14.8.8", "versionType": "custom"}, {"status": "affected", "version": "0", "lessThan": "15.7.8", "versionType": "custom"}, {"status": "affected", "version": "0", "lessThan": "26.6", "versionType": "custom"}]}]}], "published": "2026-07-27T21:17:04.043", "references": [{"url": "https://support.apple.com/en-us/128067", "tags": ["Release Notes", "Vendor Advisory"], "source": "product-security@apple.com"}, {"url": "https://support.apple.com/en-us/128071", "tags": ["Release Notes", "Vendor Advisory"], "source": "product-security@apple.com"}, {"url": "https://support.apple.com/en-us/128072", "tags": ["Release Notes", "Vendor Advisory"], "source": "product-security@apple.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-125"}]}], "descriptions": [{"lang": "en", "value": "An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to cause unexpected system termination."}], "lastModified": "2026-07-28T17:58:42.090", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9FFAC61B-E4F2-49AF-9897-96D35FAD611C", "versionEndExcluding": "14.8.8", "versionStartIncluding": "14.0"}, {"criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B3E01512-81BB-4C92-B0A5-C07F1C1A432E", "versionEndExcluding": "15.7.8", "versionStartIncluding": "15.0"}, {"criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8D3D83F1-07DF-47C2-9F3B-0BC5A1434606", "versionEndExcluding": "26.6", "versionStartIncluding": "26.0"}], "operator": "OR"}]}], "sourceIdentifier": "product-security@apple.com"}