CVE-2026-84509

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Connecting to a malicious SMB server may lead to unexpected system termination.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://support.apple.com/en-us/149035	Release Notes Vendor Advisory
https://support.apple.com/en-us/149042	Release Notes Vendor Advisory
https://support.apple.com/en-us/149043	Release Notes Vendor Advisory

Configurations

Configuration 1 (hide)

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

History

17 Sep 2026, 16:56

Type	Values Removed	Values Added
CPE		cpe:2.3:o:apple:macos::::::::
First Time		Apple macos Apple
References	~~() https://support.apple.com/en-us/149035 -~~	() https://support.apple.com/en-us/149035 - Release Notes, Vendor Advisory
References	~~() https://support.apple.com/en-us/149042 -~~	() https://support.apple.com/en-us/149042 - Release Notes, Vendor Advisory
References	~~() https://support.apple.com/en-us/149043 -~~	() https://support.apple.com/en-us/149043 - Release Notes, Vendor Advisory

17 Sep 2026, 16:18

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 6.5
CWE		CWE-125

Information

Published : 2026-09-14 21:17

Updated : 2026-09-17 16:56

NVD link : CVE-2026-84509

Mitre link : CVE-2026-84509

CVE.ORG link : CVE-2026-84509

JSON object : View

Products Affected

apple

macos

CWE

CWE-125

Out-of-bounds Read

{"id": "CVE-2026-84509", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-84509", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-17T15:08:59.116627Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "affected": [{"source": "product-security@apple.com", "affectedData": [{"vendor": "Apple", "product": "macOS", "versions": [{"status": "affected", "version": "0", "lessThan": "15.8", "versionType": "custom"}, {"status": "affected", "version": "0", "lessThan": "26.7", "versionType": "custom"}, {"status": "affected", "version": "0", "lessThan": "27", "versionType": "custom"}]}]}], "published": "2026-09-14T21:17:27.413", "references": [{"url": "https://support.apple.com/en-us/149035", "tags": ["Release Notes", "Vendor Advisory"], "source": "product-security@apple.com"}, {"url": "https://support.apple.com/en-us/149042", "tags": ["Release Notes", "Vendor Advisory"], "source": "product-security@apple.com"}, {"url": "https://support.apple.com/en-us/149043", "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 Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Connecting to a malicious SMB server may lead to unexpected system termination."}], "lastModified": "2026-09-17T16:56:34.883", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "241A56D1-1E33-4317-A053-85AF8E3770B3", "versionEndExcluding": "15.8", "versionStartIncluding": "15.0"}, {"criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1BE83000-26C0-49C5-A966-BB40AD6F8BEE", "versionEndExcluding": "26.7", "versionStartIncluding": "26.0"}], "operator": "OR"}]}], "sourceIdentifier": "product-security@apple.com"}