CVE-2026-64771 | A buffer overflow was addressed with improved bounds checkin… | CVSS 9.8 CRITICAL

Description

A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 26.6 and iPadOS 26.6, macOS Sequoia 15.7.8, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6. A remote attacker may be able to cause unexpected application termination or heap corruption.

Metadata

CVE ID: CVE-2026-64771
State: PUBLISHED
Assigner: apple
Reserved: 2026-07-20 18:10 UTC
Published: 2026-07-27 20:13 UTC
Last updated: 2026-07-28 14:00 UTC
Primary CWE: CWE-119
CWE-119 Improper Restriction of Operations within the Bounds…
Vendor / Product: Apple / iOS and iPadOS
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: total

Affected products (4)

Vendor	Product	Platform	Versions
Apple	iOS and iPadOS	—	0 < 26.6
Apple	macOS	—	0 < 15.7.8, 0 < 26.6
Apple	tvOS	—	0 < 26.6
Apple	visionOS	—	0 < 26.6

Weakness (CWE)

CWE	Source	Description
—	cna	A remote attacker may be able to cause unexpected application termination or heap corruption
CWE-119	adp	CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	adp	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (5)