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CVE-2026-20657

MEDIUM CVSS 3.1: 6.5 EPSS 0.04%
Updated Mar 26, 2026
Apple
Parameter Value
CVSS 6.5 (MEDIUM)
Affected Versions 14.0 — 18.7.7
Fixed In 18.7.7
Type CWE-787 (Out-of-bounds Write), CWE-119 (Buffer Overflow), CWE-125 (Out-of-bounds Read)
Vendor Apple
Public PoC No

The issue was addressed with improved memory handling. This issue is fixed in iOS 18.7.7 and iPadOS 18.7.7, macOS Sequoia 15.7.5, macOS Sonoma 14.8.5. Parsing a maliciously crafted file may lead to an unexpected app termination.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Vulnerable Products 4

Configuration From (including) Up to (excluding)
Apple Ipados
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
18.7.7
Apple Iphone_Os
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
18.7.7
Apple Macos
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
14.0 14.8.5
Apple Macos
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
15.0 15.7.5